Type 904L Plate

Type 904L plate also offers good resistance to a number of other inorganic acids, such as phosphoric acid and most organic acids. However, acids and acid solutions containing halide ions can be very aggressive, and the corrosion resistance of 317L, 317LMN and 904L may be insufficient.

ASTM B625 Type 904L plate Composition Chart

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	Cu
SS 904L	0.020 max	2 max	1.00 max	0.040 max	0.030 max	19.00 – 23.00	4.00 – 5.00 max	23.00 – 28.00	1.00 – 2.00

Type 904L plate is a high alloy austenitic stainless steel that is known for its corrosion properties. This low carbon version of Type 904L plate also offers other benefits to users including:

• Non-magnetic

• Stronger corrosion properties than Type 316L an 317L

• Good resistance to sulphuric, phosphoric and acetic acids

• High resistance to crevice and stress corrosion cracking

• Excellent formability and weldability

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