Į 1.4307 Nerūdijantis plienas (304L): Savybės & Paraiškos

Į 1.4307 stainless steel is one of the most widely used low-carbon austenitic stainless steels in European and international manufacturing.

Better known as the EN equivalent of 304L Nerūdijantis plienas, it combines good corrosion resistance, puikus formavimas, reliable weldability, and broad compatibility with modern manufacturing processes.

Its relatively low carbon content is particularly important. Compared with standard EN 1.4301 / AISI 304, Į 1.4307 stainless steel is designed to reduce the risk of chromium carbide precipitation during welding or prolonged exposure to sensitization temperatures.

Dėl to, it is especially suitable for welded structures, fabricated equipment, vamzdynų sistemos, cisternos, food-processing machinery, architektūriniai komponentai, and custom precision parts.

1. What Is EN 1.4307 Nerūdijantis plienas?

Į 1.4307 yra an austenitic chromium‑nickel Nerūdijantis plienas belonging to the 18/8 šeima (apytiksliai 18% chromo ir 8% Nikelis).

It is the European standard equivalent of AISI 304L (US S30403) and is also known by the chemical symbol X2CrNi18‑9.

The “L” designation indicates its low carbon content (≤0.030%), which provides superior resistance to intergranular corrosion after welding.

As an austenitic grade, 1.4307 turi a face‑centred cubic (FCC) kristalų struktūra, which imparts excellent ductility, Formavimas, ir kietumas.

Like other conventional austenitic stainless steels, Į 1.4307 is generally non-magnetic in the fully annealed condition.

Tačiau, cold working can induce a certain amount of deformation-induced martensite, which may result in slight magnetic behavior depending on the degree of deformation and the material chemistry.

The alloy is therefore frequently selected when a manufacturer requires a corrosion-resistant material that can be formed, suvirintas, apdirbta, and finished without the processing limitations associated with higher-carbon stainless steel grades.

Į 1.4307 Stainless Steel Designations and International Equivalents

2. Cheminė sudėtis 1.4307 Nerūdijantis plienas

The low carbon content is the defining feature of 1.4307, distinguishing it from standard 304 (1.4301). The table below shows the specified composition per EN 10088.

Pagrindinė įžvalga: The carbon content of ≤0.030% is the critical difference between 1.4307 (304L) ir 1.4301 (304) Nerūdijantis plienas.

This low carbon content prevents the precipitation of chromium carbides at grain boundaries during welding, eliminating sensitisation and ensuring excellent corrosion resistance in welded structures.

3. Mechanical Properties of EN 1.4307 Nerūdijantis plienas

Mechanical properties vary according to product form, storio, terminis apdorojimas, cold-work level, and applicable standard.

The following values represent typical minimum or commonly specified properties for solution-annealed EN 1.4307 produktai.

4. Fizinės ir šiluminės savybės

The following values are representative for EN 1.4307 / X2CrNi18-9 stainless steel.

Actual properties may vary slightly depending on product form, manufacturing condition, temperatūra, and the applicable material standard.

One of the most important engineering characteristics of 1.4307 yra jo relatively high coefficient of thermal expansion compared with ferritic steels and carbon steels.

Components subjected to significant temperature fluctuations may therefore experience greater dimensional change.

This must be considered when designing long pipelines, Šilumokaičiai, welded structures, tikslūs mazgai, and components joined to materials with different thermal expansion behavior.

Temperatūros našumas

• Low-temperature performance: Like all austenitic stainless steels, 1.4307 exhibits no ductile-to-brittle transition and retains excellent toughness down to cryogenic temperatures.
  It is suitable for service down to -196°C and is widely used for cryogenic storage and processing equipment.
• Aukštos temperatūros našumas: Continuous service temperature is typically limited to 800–870°C for oxidation resistance.
  The low carbon content slightly reduces high-temperature creep strength relative to higher-carbon 1.4301, so it is not the first choice for load-bearing high-temperature structures.

5. Atsparumas korozijai 1.4307 Nerūdijantis plienas

Corrosion resistance is one of the defining advantages of EN 1.4307 Nerūdijantis plienas.

Its corrosion performance is primarily derived from the formation of a thin, prisirišęs, and self-repairing chromium oxide passive film ant paviršiaus.

When the surface is mechanically damaged, oxygen exposure allows this passive layer to reform, provided the environment is suitable for repassivation.

Bendras atsparumas korozijai

Į 1.4307 stainless steel performs well in environments involving:

• Indoor and normal outdoor atmospheric exposure.
• Freshwater and many clean water systems.
• Food-processing environments.
• Organic chemicals.
• Many mildly oxidizing acids.
• Pharmaceutical and sanitary equipment.
• General industrial fabrication.

The actual corrosion resistance depends heavily on surface finish, gamybos kokybė, cheminis poveikis, temperatūra, chlorido koncentracija, and cleaning conditions.

Lygus, properly cleaned, and passivated surface generally performs better than a rough or contaminated surface.

Iron contamination introduced during machining, šlifavimas, or fabrication can compromise surface corrosion resistance if not removed.

Resistance to Intergranular Corrosion

The major metallurgical advantage of EN 1.4307 over EN 1.4301 yra jo mažesnis anglies kiekis, generally limited to approximately 0.03% maksimalus.

During welding or exposure to certain elevated temperatures, carbon can combine with chromium to form chromium carbides at grain boundaries.

This process can locally reduce the chromium concentration and create regions more susceptible to intergranular corrosion.

The reduced carbon content of 1.4307 minimizes this risk. Dėl to, the material is particularly suitable for:

• Welded pressure vessels.
• Tanks and pipelines.
• Fabricated process equipment.
• Structures where post-weld solution annealing is impractical.
• Components containing multiple welds or complex welded geometries.

Įbrėžimas ir plyšio korozija

Although EN 1.4307 stainless steel provides good general corrosion resistance, it is not specifically designed for severe chloride environments.

Chloride ions can locally damage the passive film and initiate Korozija arba įtrūkimų korozija.

The risk increases with:

• Higher chloride concentration.
• Elevated temperature.
• Stagnant conditions.
• Crevices and deposits.
• Rough or contaminated surfaces.
• Poor drainage.

Todėl, Nerūdijantis plienas 1.4307 may not be the preferred choice for direct seawater exposure, highly concentrated salt solutions, or aggressive chloride-containing process media.

Šiose aplinkose, molybdenum-containing grades such as Į 1.4404 / 316L generally provide improved resistance.

Streso korozijos įtrūkimas

Like all standard austenitic stainless steels, 1.4307 stainless steel is susceptible to chloride stress corrosion cracking at temperatures above approximately 60°C.

The low-carbon modification does not improve SCC resistance. For hot chloride service environments, duplex or ferritic stainless steels offer inherently better performance.

6. Weldability of EN 1.4307 Nerūdijantis plienas

Į 1.4307 is widely regarded as having Puikus suvirinamumas, which is one of the main reasons for its extensive use in tanks, vamzdynai, process equipment, architektūrinės konstrukcijos, and fabricated stainless steel components.

Its low carbon content reduces the tendency toward sensitization and improves resistance to intergranular corrosion in the heat-affected zone after welding.

Daugelyje programų, this allows welded assemblies to be used without post-weld solution annealing.

Suitable Welding Processes

Į 1.4307 can be welded using most conventional fusion-welding processes, įskaitant:

• TIG/GTAW welding.
• MIG/GMAW welding.
• Plasma arc welding.
• Lazerinis suvirinimas.
• Atsparinis suvirinimas.
• Orbital welding.
• Submerged arc welding for suitable heavy-section applications.

The choice of process depends on component thickness, joint geometry, gamybos apimtis, matmenų reikalavimai, and surface-quality expectations.

Užpildo metalo pasirinkimas

For welded joints, filler materials are commonly selected to provide compatible corrosion resistance and weld-metal properties.

Depending on the applicable standard and service conditions, commonly used filler categories include ER304L (AWS A5.9)-type consumables; 308L is also suitable, which are designed for welding 304L-type stainless steels.

7. Common Manufacturing Processes for 1.4307 Stainless Steel Components

Į 1.4307 stainless steel is valued not only for its corrosion resistance and weldability, but also for its broad manufacturing versatility.

Lakštinio metalo gamyba

Lakštinio metalo gamyba is one of the most widely used manufacturing routes for EN 1.4307.

The material is supplied in sheet, plokštelė, juostelė, or coil form and can be processed through cutting, lenkimas, perforavimas, riedėjimas, and forming operations to produce components ranging from simple brackets to large fabricated enclosures and process equipment.

Because EN 1.4307 combines good ductility with reliable corrosion resistance, it is particularly suitable for components requiring complex bends, welded seams, or hygienic surfaces.

Tipiškos programos

Common applications include food-processing equipment, stainless steel cabinets, machine guards, elektros gaubtai, Sandėliavimo rezervuarai, kanalizacija, architektūrinės plokštės, Cheminio perdirbimo įranga, and fabricated piping components.

CNC apdirbimas

CNC apdirbimas is used when EN 1.4307 components require high dimensional accuracy, tikslios skylės, Siūlai, sandarinimo paviršiai, or complex three-dimensional geometries.

Typical operations include CNC turning, frezavimas, gręžimas, nuobodus, bakstelėjimas, ir šlifavimas.

The process is particularly suitable for custom components, prototipai, žemas- iki vidutinės apimties produkcijos, and parts that require tight tolerances that may be difficult to achieve through forming or casting alone.

Tipiškos programos

Į 1.4307 CNC-machined components include valve bodies and fittings, siurblio komponentai, velenai, flanšai, kolektoriai, tikslūs korpusai, threaded connectors, medical and laboratory equipment parts, and custom components for food and chemical processing systems.

Investicijų liejimas

Investicijų liejimas, taip pat žinomas kaip prarasto vaško liejimas, is suitable for manufacturing EN 1.4307 stainless steel components with complex geometry that would require extensive machining if produced from solid bar or billet.

The process involves producing a wax pattern, building a ceramic shell around the pattern, removing the wax, and pouring molten stainless steel into the resulting cavity.

Po sukietėjimo, the ceramic shell is removed and the casting undergoes cleaning, apdaila, ir, kur reikia, precizinis apdirbimas.

Tipiškos programos

Typical EN 1.4307 investment-cast components include valve and pump bodies, vamzdžių jungiamosios detalės, sparnuotojai, skliaustai, Jūrų įranga, food-processing machinery components, architektūrinė įranga, and complex industrial equipment parts.

Suvirinimas ir gamyba

Suvirinimas is a core manufacturing process for 1.4307 Nerūdijantis plienas, particularly when producing large assemblies that cannot be economically manufactured as a single piece.

Components may be cut and formed separately before being joined through TIG, Aš, lazeris, pasipriešinimas, or other suitable welding processes.

This approach allows manufacturers to create tanks, kadrai, vamzdynų sistemos, įrangos korpusai, and custom structural assemblies.

Tipiškos programos

Welded EN 1.4307 structures are widely used in storage tanks, proceso indai, Vamzdynai, food and beverage equipment, pharmaceutical systems, industrial frames, exhaust assemblies, architektūrinės konstrukcijos, and custom machinery.

Deep Drawing and Stamping

Deep drawing and stamping are high-efficiency forming processes used primarily for medium- to high-volume production of thin-walled EN 1.4307 stainless steel components.

In stamping, sheet metal is cut or formed using dies and presses.

Deep drawing extends this principle by transforming a flat sheet blank into a hollow or three-dimensional shape through controlled plastic deformation.

These processes are particularly effective for producing consistent components with short cycle times once the tooling has been developed.

Tipiškos programos

Typical applications include sinks, Virtuvės įranga, maisto konteineriai, appliance components, stainless steel housings, cups and vessels, automobilių komponentai, medical equipment parts, and thin-walled industrial enclosures.

Lazerio pjaustymas

Lazerio pjaustymas is a highly flexible thermal cutting process used to produce precise two-dimensional profiles from EN 1.4307 sheet and plate.

A focused laser beam melts or vaporizes the material along a programmed cutting path, while an assist gas removes molten material from the cutting zone.

The process is commonly integrated into automated sheet metal manufacturing systems and can rapidly produce complex profiles without dedicated punching dies.

Tipiškos programos

Laser-cut EN 1.4307 components are commonly used for machine panels, skliaustai, gaubtai, flanšai, montavimo plokštės, architektūriniai komponentai, maisto perdirbimo įranga, industrial guards, control cabinets, and parts subsequently formed or welded into larger assemblies.

8. Surface Finishes for EN 1.4307 Nerūdijantis plienas

Surface finish is an important part of EN 1.4307 stainless steel component manufacturing.

It affects not only appearance, bet ir atsparumas korozijai, valomumas, trintis, dėvėjimo elgesys, paviršiaus šiurkštumas, and suitability for hygienic applications.

Nors 1.4307 stainless steel inherently develops a passive chromium-rich oxide film, manufacturing operations such as cutting, suvirinimas, šlifavimas, apdirbimas, and forming can alter the surface condition.

Appropriate finishing and post-treatment can therefore help restore or improve the functional performance of the finished component.

Common Surface Finishes

9. Applications of EN 1.4307 Nerūdijantis plienas

The combination of low carbon content, Geras atsparumas korozijai, Puikus suvirinamumas, geras formavimas, and attractive surface characteristics makes EN 1.4307 stainless steel suitable for a broad range of industrial applications.

Maisto ir gėrimų pramonė

Food processing is one of the most important application areas for 1.4307 Nerūdijantis plienas.

Its corrosion resistance and ease of cleaning make it suitable for equipment that comes into contact with water, maisto produktai, cleaning solutions, and atmospheric moisture.

Tipiški komponentai apima:

• Processing tanks and vessels.
• Maisto perdirbimo mašinos.
• Conveyors and structural components.
• Hoppers and chutes.
• Piping and fittings.
• Maišymo įranga.
• Storage containers.
• Kitchen and catering equipment.

Architectural and Building Applications

1.4307 stainless steel is also widely used in architectural applications where a combination of corrosion resistance, išvaizda, and fabrication flexibility is required.

Tipiški produktai apima:

• Dekoratyvinės plokštės.
• Interior wall cladding.
• Elevator components.
• Turėklai.
• Architectural trim.
• Door and window components.
• Stainless steel fixtures.
• Decorative structural elements.

Chemical and Process Equipment

1.4307 stainless steel can be used in many chemical-processing environments where the combination of corrosion resistance and weldability is sufficient.

Pavyzdžiai apima:

• Process tanks.
• Sandėliavimo indai.
• Pipework.
• Pumps and fittings.
• Heat-transfer equipment.
• Industrial manifolds.
• Chemical handling equipment.

Automobilių pramonė

1.4307 stainless steel can be used in Automobiliai and transportation applications requiring corrosion resistance and good fabrication characteristics.

Applications may include:

• Exhaust-related components.
• Brackets and supports.
• Heat shields.
• Dekoratyvinė apdaila.
• Structural fabricated components.
• Fluid-handling components.

Pharmaceutical and Medical Equipment

Atsparumo korozijai derinys, valomumas, and weldability makes 1.4307 stainless steel suitable for selected pharmaceutical and medical equipment.

Applications can include:

• Processing vessels.
• Laboratorinė įranga.
• Fluid-handling systems.
• Įrangos rėmai.
• Pharmaceutical processing components.
• Sanitary piping assemblies.

Aliejus, Dujos, and Industrial Equipment

1.4307 stainless steel is used in selected oil, dujos, energija, and general industrial applications where environmental conditions fall within its corrosion-resistance capabilities.

Tipiški komponentai apima:

• Vamzdžių jungiamosios detalės.
• Skliaustai.
• Įrangos korpusai.
• Vožtuvai and manifolds.
• Storage equipment.
• Struktūriniai komponentai.
• Instrumentation hardware.

10. Privalumai ir apribojimai

Į 1.4307 stainless steel is best understood as a low-carbon, fabrication-oriented member of the 18Cr–8Ni austenitic stainless steel family.

Key Advantages of 1.4307 Nerūdijantis plienas

Excellent resistance to intergranular corrosion in welded conditions

The carbon content of EN 1.4307 is typically limited to ≤0.030%, substantially reducing the tendency for chromium carbide precipitation at grain boundaries during welding.

Dėl to, properly fabricated 1.4307 components generally have good resistance to weld-related intergranular corrosion without requiring post-weld solution annealing in many conventional applications.

This characteristic makes the grade particularly attractive for welded tanks, vamzdynai, maisto perdirbimo įranga, architektūrinės konstrukcijos, and fabricated machinery.

Excellent ductility and cold-forming capability

The austenitic microstructure provides high ductility and allows 1.4307 to undergo substantial plastic deformation without cracking.

It is therefore well suited to lenkimas, gilus piešimas, štampavimas, riedėjimas, and other cold-forming operations.

This combination of ductility and corrosion resistance makes it particularly useful for thin-walled components and geometrically complex sheet-metal products.

Good low-temperature toughness

Kaip austenitinis nerūdijantis plienas, Į 1.4307 does not exhibit the pronounced ductile-to-brittle transition characteristic of ferritic and many carbon steels.

Properly produced austenitic 304L-type material can retain useful toughness at cryogenic temperatures, with applications extending toward approximately –196°C (77 K) when the relevant product form, sąlyga, standartinis, and design requirements are satisfied.

Tai daro 1.4307 a candidate for selected low-temperature vessels, Laboratorijos įranga, cryogenic auxiliaries, and fluid-handling systems.

Actual cryogenic qualification should always be based on the applicable material specification and testing requirements.

Strong general-purpose corrosion resistance

Į 1.4307 provides corrosion performance broadly comparable to conventional 1.4301/304 stainless steel in many atmospheric, food-processing, and moderately corrosive environments.

Its approximately 18% Chromas content supports formation of a protective passive film, while nickel stabilizes the austenitic structure and contributes to its ductility and corrosion performance.

Todėl, 1.4307 offers an effective balance between atsparumas korozijai, Gamyba, ir medžiagų kaina for general-purpose stainless steel applications.

Excellent hygienic and cleanability characteristics

When appropriately finished, Į 1.4307 provides a smooth, non-porous metallic surface that can be readily cleaned and maintained.

Mechaninis poliravimas, pasyvavimas, and electropolishing can further improve surface cleanliness and reduce sites where contaminants or process residues can accumulate.

This makes the grade widely applicable to food-processing, gėrimas, Farmacija, laboratory, and sanitary equipment, provided the selected surface finish and fabrication practices meet the relevant industry requirements.

Broad manufacturing compatibility

Į 1.4307 stainless steel can be processed using virtually all conventional stainless steel manufacturing technologies.

This manufacturing flexibility is particularly valuable for custom stainless steel components because the same material can be used across prototypes, pagaminti mazgai, tiksliai apdirbtos dalys, ir sudėtingi liejiniai.

Inherent Limitations of 1.4307 Nerūdijantis plienas

Moderate resistance to pitting and crevice corrosion

Nors 1.4307 performs well in many general environments, it does not contain the molybdenum addition characteristic of 316L/1.4404 stainless steel.

Todėl, its resistance to Chlorido sukeltas duobių ir plyšių korozija is significantly more limited than that of molybdenum-alloyed austenitic stainless steels.

Long-term exposure to seawater, concentrated chloride solutions, marine splash zones, or severe salt environments may therefore require 1.4404/316L, dvipusis nerūdijantis plienas, or a higher-alloy material.

Chloride stress corrosion cracking remains a service consideration

Like other austenitic stainless steels, Į 1.4307 can be susceptible to chloride-induced stress corrosion cracking under the combined conditions of tempimo įtempis, chloride contamination, and elevated temperature. The risk increases as temperature and chloride severity increase.

There is no universal temperature threshold applicable to every service condition; todėl, values around 60° C. should be regarded only as an engineering warning range rather than a guaranteed safe/unsafe boundary.

Not a preferred grade for heavily loaded high-temperature structures

1.4307 stainless steel is a general-purpose corrosion-resistant grade rather than a specialized creep-resistant alloy.

Esant aukštai temperatūrai, its long-term mechanical performance and creep resistance may become limiting factors.

For components subjected to sustained mechanical loading at high temperature, dedicated heat-resistant stainless steels or nickel-based alloys may provide a more appropriate solution.

Moderate machinability and significant work hardening

Compared with free-machining steels, Nerūdijantis plienas 1.4307 can be more demanding to machine. Its austenitic structure tends to work harden, while its relatively low thermal conductivity can concentrate heat near the cutting zone.

Effective machining therefore requires rigid fixturing, appropriate carbide tooling, kontroliuojami pjovimo parametrai, adequate coolant, and good chip evacuation.

Poor machining conditions can accelerate tool wear and degrade surface finish.

Higher material cost than carbon steel and some alternative stainless grades

The presence of chromium and nickel makes 304L stainless steel substantially more expensive than ordinary carbon steel. Its price can also vary considerably with nickel market conditions and product form.

Tačiau, comparing material price alone can be misleading.

Longer service life, reduced corrosion-related maintenance, suvirinamumas, valomumas, and lower replacement frequency can make 1.4307 economically attractive over the complete life cycle of a component.

11. Lyginamoji analizė: Į 1.4307 vs. Į 1.4301 vs. Į 1.4404 Nerūdijantis plienas

Į 1.4307, Į 1.4301, ir EN 1.4404 are all widely used austenitic stainless steels, but they are optimized for somewhat different service conditions.

*Mechanical-property requirements vary with product form, storio, delivery condition, and governing standard.

Values should therefore be verified against the applicable EN product specification rather than treated as universal material constants.

12. Custom Precision Stainless Steel Parts from DEZE

DEZE liejykla teikia custom stainless steel casting and precision machining solutions for components manufactured from EN 1.4307 (304L) and other austenitic and heat-resistant stainless steel grades.

The manufacturing approach is selected according to part geometry, matmenų reikalavimai, gamybos apimtis, material specification, ir aptarnavimo sąlygas.

For complex stainless steel components, Investicijų liejimas can reproduce intricate contours, Plonos sekcijos, vidinių savybių, and integrated mounting structures while reducing the amount of subsequent machining.

Where tighter dimensional requirements apply, cast components can undergo CNC turning, frezavimas, gręžimas, šlifavimas, and other secondary operations.

13. Išvada

Į 1.4307 stainless steel is far more than simply a “low-carbon version of 304”.

It is a purpose-engineered austenitic stainless steel grade that solves one of the most persistent practical problems of standard 18/10 Nerūdijantis plienas: intergranular corrosion in welded heat-affected zones.

By limiting carbon to 0.03% maksimalus, the grade retains nearly identical mechanical properties and general corrosion performance as 1.4301, while adding the critical benefit of full corrosion integrity in the as-welded condition.

For food processing equipment, chemijos talpyklos, architectural structures and water systems — all applications where welded fabrication is the norm and post-weld annealing is impractical — 1.4307 is the technically correct and cost-optimal material choice.

It occupies an essential niche between general-purpose 1.4301 and higher-alloy 1.4404, providing reliable, cost-effective corrosion performance for the vast majority of moderately corrosive industrial environments.

 

DUK

Is 1.4307 nerūdijančio plieno magnetas?

Atkaitintos būklės, Į 1.4307 stainless steel is generally essentially non-magnetic or only very weakly magnetic.

Tačiau, cold forming can induce some martensitic transformation, resulting in measurable magnetic response.

Is 1.4307 equivalent to 316L stainless steel?

Ne. 1.4307 is a 304L-type stainless steel, kadangi 1.4404 is the European designation commonly associated with 316L.

The key distinction is that 1.4404 contains molybdenum, giving it substantially better resistance to chloride-induced pitting and crevice corrosion.

What is the maximum operating temperature for 1.4307?

Up to 800°C for continuous service and 850°C for intermittent service. Above 850°C, oxidation scaling increases significantly.

Is EN 1.4307 the same as 304L stainless steel?

Taip. Į 1.4307 corresponds to X2CrNi18-9 and is commonly associated with AISI 304L / US S30403.

The exact equivalence should nevertheless be confirmed against the applicable product standard because chemical and mechanical requirements can vary between specifications.

Koks skirtumas tarp 1.4307 ir 1.4301 Nerūdijantis plienas?

The principal difference is carbon content. 1.4307 has a maximum carbon content of approximately 0.030%, kadangi 1.4301 permits up to approximately 0.070%.

The lower carbon content of 1.4307 stainless steel improves resistance to weld-related sensitization and makes it particularly suitable for welded fabrication.