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SS304 / SS304L

Stainless steel 304(SS304) is the most basic stainless steel known as 18-8 grade with higher chromium and low carbon content. The low carbon content restricts carbide precipitation during welding as well as minimizes its susceptibility to intergranular corrosion. Stainless steel 304L(SS304L) is an extra low-carbon variation of SS304 with a 0.03% maximum carbon content that eliminates carbide precipitation due to welding. Both SS304 and SS304L have excellent resistance to a wide range of atmospheric, chemical and petrochemical, and food industry corrosions. Usually, they can be used in applications with the maximum temperature of 1650°F[900°C] exhibiting good oxidation resistance.

ASTM A403 WP304L (SS304L) butt welding pipe fittings

ASTM A403 WP304L (SS304L) butt welding pipe fittings: elbows, reducers, tees.

1. UNS Designation & International Equivalent

TypeUNSJISEN/DINEN/BSEN/NFISOGBGOST
304S30400SUS304X5CrNi18-10304S31Z7CN18.09110Cr18Ni908KH18H10
304LS30403SUS304LX2CrNi19-11304S11X2CrNi19-111000Cr19Ni1103KH18H11
*The international equivalent of SS304/ 304L: JIS-Japan, DIN-Germany, BS-UK, NF-France, ISO, GB-China, GOST-Russia.

2. Product Forms and Standards of SS304 / SS304L

Product FormsMaterial Standards
Plates, Sheets & StripsASTM A240, A666
Billets, Bars & RodsASTM A276, A314, A479
Forgings(Flanges & Fittings)ASTM A182, A473.
WiresASTM A313, A368, A478, A492, A493, A580.
Seamless and Welded PipesASTM A312, A358, A813, A814.
Wrought Pipe FittingsASTM A403
Castings(Cast Fittings & Valve Parts)ASTM A351, A743, A744
*Especially, Metals-Piping supplies SS304/ SS304L in the grades of ASTM A312 TP304/ TP304L, ASTM A182 F304/ F304L, ASTM A403 WP304/ 304L, ASTM A351 CF8/ CF3.

3. Physical Properties of SS304/ SS304L

ASTM A182 F304 W/N flanges, 150# 2" SCH40.

ASTM A182 F304 W/N flanges, 150# 2″ SCH40.

DensityMelting RangeSpecific HeatMagnetic PermeabilityElectric Resistivity
g/cm3°FkJ/kg*KOerstedsmicrohm-cm
8.032550-26500.50≤1.0272

4. Chemical Composition Requirements

ElementSS304SS304L
Carbon≤0.08≤0.03
Manganese≤2.00≤2.00
Phosphorus≤0.045≤0.045
Sulfur≤0.030≤0.030
Silicon≤0.75≤0.75
Chromium18.00-20.0018.00-20.00
Nickel8.00-12.008.00-12.0
Nitrogen≤0.10≤0.10
IronBalanceBalance

5. Mechanical Properties of SS304/ 304L

ASTM A240 SS 304 plates, 2m(L)x1m(W)x2.5mm(THK).

ASTM A240 SS 304 plates, 2m(L)x1m(W)x2.5mm(THK).

GradesTensile Strength ksi(Mpa), min.Yield Strength, ksi(Mpa)Elongation, %Hardness, Rockwell
SS30485(586)35(241)55B80
SS304L90(621)42(290)55B82

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Austenitic Stainless Steel

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    Hebei Metals Industrial Limited
    (Shijiazhuang Metalsin Pipeline Tech Co., Ltd)
    No. 176, Zhonghua South Street, Shijiazhuang, China.
    Tel: +86-311-89642206
    Fax:+86-311-67906676
    Web: www.metalspiping.com
    Email: sales@metalspiping.com