合金 304 & 304L
应用

特性
304/304L has excellent forming and welding characteristics. It also has an excellent resistance to intergranular corrosion in as-welded condition. Dual grade becomes important if heavy gauge welding is performed. This is where intergranular corrosion comes into picture and having a lower carbon version makes it difficult for Chromium Carbide to precipitate in the 797 to 1580 degF (425 to 860 degC) range when the welding is going on for a long time due to the heavy gauge. Finally, it has excellent strength and toughness at cryogenic temperatures.
In warm chloride environments, it is prone to pitting and crevice corrosion and also to stress corrosion cracking above 140 degF (60 degC).
规格
Chemistry/304
C – 0.08 max
Mn – 2 max
P – 0.045 max
S – 0.03 max
Si – 1 max
Cr – 18 to 20
Ni – 8 to 11
Chemistry/304L
C – 0.035 max
Mn – 2 max
P – 0.045 max
S – 0.03 max
Si – 1 max
Cr – 18 to 20
Ni – 8 to 11
Mechanical Properties
Both 304 and 304L have the same mechanical properties.
304/304L
Yield Strength – 205 MPa minimum
Tensile Strength – 515 MPa minimum
% elongation – 35% minimum (longitudinal)
Common specifications
Pipes – SA/A312, SA/A358
Fittings – SA/A403
Flanges/ Forgings – SA/A182
Tubes – SA/A213, SA/A249, SA/A269
Bars – SA/A276
Plates – SA/A240
型号 | 尺寸 | 壁厚 | ASTM 标准 |
---|---|---|---|
棒 | A276, A479 | ||
对焊管件 | 1/2″ thru 12″ | Sch 10, 40, 80, 160 & XXH | A403 |
锻造件 | 1/2″ thru 8″ | A182 | |
无缝管 &焊接管 | 1/4″ thru 16″ | Sch 10, 40, 80, 160 & XXH | A312 |
公称焊管 | A249 | ||
无缝公称管 | A213 | ||
板 | A240 | ||
法兰 & 压力管件 | All Descriptions |