Stainless Steel 304 1.4301

Stainless Steel 304 1.4301

Type 304 (S30400), Type 304L (S30403) Stainless Steel Description Type 304/304L is the modern version of “18-8” stainless steel containing approximately 18% chromium and 8% nickel and is the most commonly specified stainless steel used throughout the world. Type 304/304L is a versatile, general...
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Type 304 (S30400), Type 304L (S30403) Stainless Steel

Description

Type 304/304L is the modern version of “18-8” stainless steel containing approximately 18% chromium and 8% nickel and is the most commonly specified stainless steel used throughout the world. Type 304/304L is a versatile, general purpose stainless steel with good resistance to atmospheric corrosion, and to many chemicals and food and beverages. These grades can be specified in the annealed condition where they have very good formability. Higher nickel versions can be specified to enhance multi-stage deep drawing characteristics. Higher strength, cold-worked conditions can also be specified for Type 304/304L for spring type applications. Type 304/304L is non-magnetic in the annealed condition but may become slightly magnetic as a result of cold working.


Type 304L can be dual certified as 304 when the composition meets the lower carbon limit of 304L and the slightly higher strength levels of 304. Type 304L should be specified for welded applications as the low carbon version eliminates chromium carbide precipitation and enhances the corrosion resistance in the as-welded condition.


Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*

Element

304

304L

Carbon

0.07

0.03 max

Chromium

17.5-19.5

17.5-19.5

Nickel

8.0-10.5

8.0-12.0

Manganese

2.00

2.00

Silicon

0.75

0.75

Nitrogen

0.10

0.10

Phosphorus

0.045

0.045

Sulfur

0.030

0.030

* Maximum, unless range is indicated


Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240

Property

304

304L

Yield Strength, min. (ksi)

30

25

Tensile Strength, min. (ksi)

75

70

Elongation, min. (%)

40

40

Hardness, max. (Rb)

92

92


Physical Properties
Physical properties for Type 304/304L stainless steel

Property

304/304LData

Density, lb/in3

0.285

Modulus of Elasticity, psi

28 x 106

Coefficient of Thermal Expansion, 68-212˚F, /˚F

9.2 x 10-6

Thermal Conductivity, Btu/ft hr ˚F

9.4

Specific Heat, Btu/lb ˚F

0.12

Electrical Resistivity, Microohm-in

28.3


Standards
Typical standards for Type 304/304L stainless steel

304

304L

ASTM A240

ASTM A240

ASTM A666

ASTM A666

ASME SA240

ASME SA240

AMS 5513

AMS 5511


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