SUS 316L, 304, 317L & 430 Chemical & Mechanical Properties | MachineMFG

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SUS 316L, 304, 317L & 430 Chemical & Mechanical Properties

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SUS316(L) – 00Cr17Ni14Mo2

With the addition of Mo (2-3%), it achieves excellent pitting and corrosion resistance, and outstanding high-temperature creep strength.

Characteristics and practical applications:

DifferenceSUS316(L)
CharacteristicsExcellent resistance to intergranular corrosion
UsageBoiler tubes, marine structures
SUS 316L, 304, 317L & 430 Chemical & Mechanical Properties

Chemical composition: (Unit: wt%)

SpecificationCSiMnPSCrNiOthers 
SUS316≤0.08≤1.00≤2.00≤0.045≤0.03016.0~18.010.0~14.0Mo: 2~3
SUS316L≤0.03≤1.00≤2.00≤0.045≤0.03016.0~18.012.0~15.0Mo: 2~3

Mechanical Properties:

SpecificationYS(Mpa)TS(Mpa)EL(%)Hv
TYPE
SUS316
≥205≥520≥40≤200
TYPE
SUS316L
≥175≥480≥40≤200

SUS304 – 0Cr18Ni9

As a fundamental type under the austenite series, it boasts excellent corrosion resistance, heat resistance, low-temperature strength, and mechanical properties. It does not harden after heat treatment, and exhibits almost no magnetism.

Practical uses and characteristics:

DifferenceSUS304SUS304L
CharacteristicsAustenitic steel is the most commonly used steel variety;

It exhibits excellent corrosion and heat resistance;

Its low-temperature strength and mechanical properties are superior;

As a single-phase austenitic structure, it does not harden with heat treatment.
Compared to 304, it has superior corrosion resistance.
Usage1. Tableware, exterior materials, construction materials, automotive parts

2. Medical devices, chemicals, food processing, fiber industry

3. Marine components.
For chemical, coal, and petroleum industries requiring high resistance to intergranular corrosion in their equipment,

Chemical composition: (Unit: wt%)

SpecificationCSiMnPSCrNiOthers  
SUS316≤0.08≤1.00≤2.00≤0.045≤0.03016.0~18.010.0~14.0Mo: 2~3
SUS316L≤0.03≤1.00≤2.00≤0.045≤0.03016.0~18.012.0~15.0Mo: 2~3

Mechanical Properties:

SpecificationYS(Mpa)TS(Mpa)EL(%)Hv
TYPE
SUS316
≥205≥520≥40≤200
TYPE
SUS316L
≥175≥480≥40≤200

SUS317L – 00Cr19Ni13Mo3

Steel TypeSUS317L-00Cr19Ni13Mo3
CharacteristicsType 317L steel demonstrates superior seawater resistance and stress corrosion cracking (SCC) resistance compared to Type 316L.
ApplicationsIt is utilized in chemical vessels, chemical product reactors, and other equipment requiring high corrosion resistance.

Chemical composition: (Unit: wt%)

SpecificationCSiMnPSNiCrMoOTHERS 
TYPE
317L
≤0.030≤1.00≤2.00≤0.045≤0.03011.0-15.018.0-20.03.0-4.0

Mechanical Properties:

SpecificationYS(Mpa)TS(Mpa)EL(%)Hv
TYPE
317L
≥176≥480≥40≤200

SUS 430

1. Overview

This ferritic stainless steel, widely used, contains 17% Cr and exhibits a mixed phase (α+γ) at high temperatures. Below 1000°C, it has a single phase BCC structure.

2. Characteristics:

    1) It exhibits excellent deep-drawability, similar to that of 304 steel.

    2) It possesses strong corrosion resistance to oxidative acids and has a certain level of resistance to alkalis, most organic acids, and inorganic acids. Its stress corrosion cracking resistance is superior to 304 steel.

    3) It has a lower coefficient of thermal expansion than 304 steel, and high oxidation resistance, making it suitable for heat-resistant equipment.

    4) Cold-rolled products have good surface brightness and aesthetic appeal.

    5) It is more affordable than 304 steel, often used as a replacement.

3. Applications

It is primarily used for high-polish decorative purposes in mild atmospheres, such as gas stove surfaces, appliance components, cutlery, interior building decor, washbasins, washing machine drums, etc.

4. Chemical Composition (JIS G 4305-2005)

Chemical CompositionCSiMnPSCr
Standard£0.12£0.75£1.00£0.040£0.03016.00-18.00
General0.0400.300.450.0200.00416.30

5. Performance (JIS G 4305-2005)

Differentiation Mechanical propertiesMachinability
Ys
(Mpa)
Ts
(Mpa)
El
(%)
HvCCVLDREr
(mm)
Standard≥ 205≥ 450≥ 22≤ 200
General3305052715528.01.988.7

6. Physical Properties

Density
(g/cm3)
MagnetismResistance
(10-6.W.cm)
Specific Heat250C
(J/kg.0C)
Thermal Conductivity
1000C
(W/m. 0C)
Coefficient of thermal expansion
20~1000C
(10-6/0C)
Young’s Modulus
200C 
(Gpa)
7.70Have53.646026.010.4219

7. Heat Treatment

Melting Point: 1425-15100C;

   Annealing: 780-8500C.

8. Condition of Use

1) Annealed State:

   NO.1, 2D, 2B, N0.4, HL, BA, Mirror, and various other surface treatment states.

9. Usage Precautions

  • Relative to 304, has inferior stretchability and weldability;
  • As it is ferritic stainless steel, it has lower strength and its work hardening capability is also low, which should be considered when choosing to use;
  • After stretch forming, surface ridging defects may appear in the rolling direction, posing significant challenges to polishing operations.

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