Stainless Steel EN 1.4307, ASTM 304L / UNS S30403

Stainless Steel EN 1.4307, ASTM 304L / UNS S30403

EN 1.4307, ASTM TYPE 304L / UNS S30403 Stainless Steel Typical Applications Fasteners Flanges Valves Pressure fittings Chemical Composition (as % by mass) Mechanical Properties Physical Properties Values according to EN 10088 Possible alternative grades to 304 grade stainless steel
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Product Details

EN 1.4307, ASTM TYPE 304L / UNS S30403 Stainless Steel

Typical Applications

  • Fasteners

  • Flanges

  • Valves

  • Pressure fittings


Chemical Composition (as % by mass)


CMnCrNiMoN

Typical

0.02


18.1

8.1



ASME II A SA-240

≤0.030

≤2.00

17.5-19.5

8.0-12.0


≤0.10

ASTM A240

≤0.030

≤2.00

17.5-19.5

8.0-12.0


≤0.10

ASTM A666

≤0.030

≤2.00

18.0-20.0

8.0-12.0


≤0.10

EN 10028-7

≤0.030

≤2.00

17.5-19.5

8.0-10.5


≤0.10

IS 6911

≤0.030

≤2.00

17.5-19.5

8.0-12.0

≤0.70

≤0.10


Mechanical Properties

StandardRp0.2Rp1.0

Rm

ElongationRockwellHB

MPa

MPa

MPa

%



Cold rolled coil and sheet

Typical (thickness 1 mm)

295

325

650

70



ASME II A SA-240

≥ 170


≥ 485



≤ 201

ASTM A240

≥ 170


≥ 485


≤ 92HRB

≤ 201

EN 10028-7

≥ 220

≥ 250

520-700

≥ 45



IS 6911

≥ 170


≥ 485


≤ 92HRB

≤ 201


Physical Properties

Values according to EN 10088

DensityModulus of elasticityThermal exp. at 100 °CThermal conductivity

kg/dm3

GPa

10-6/°C

W/m°C

7.9

200

16.0

15


Possible alternative grades to 304 grade stainless steel

Grade

Why it might be chosen instead of 304

301L

A higher work hardening rate grade is required for certain roll formed or stretch formed components.

302HQ

Lower work hardening rate is needed for cold forging of screws, bolts and rivets.

303

Higher machinability needed, and the lower corrosion resistance, formability and weldability are acceptable.

316

Higher resistance to pitting and crevice corrosion is required, in chloride environments

321

Better resistance to temperatures of around 600-900 °C is needed…321 has higher hot strength.

3CR12

A lower cost is required, and the reduced corrosion resistance and resulting discolouration are acceptable.

430

A lower cost is required, and the reduced corrosion resistance and fabrication characteristics are acceptable.


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