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Duplex Stainless Steel Investment Cast Alloy Chemical Compositions

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Duplex Stainless Steel Alloy Chemistry
	Carbon Max	Manganese Max	Silicon Max	Chromium Min-Max	Nickel Min-Max	Molybdenum Min-Max	Phosphorous Max	Sulfur Max	Copper Min-Max	Iron	Other	Melting Range
Alloy Type
ASTM A890 Grade 1A (CD4MCu)	0.04	1.00	1.00	24.5-26.5	4.75-6.00	1.75-2.25	0.040	0.040	2.75-3.25	Bal.		2630-2680
ASTM A890 Grade 4A (CD3MN)	0.03	1.50	1.00	21.0-23.0	4.5- 6.5	2.5-3.5	0.040	0.020	1.00 Max	Bal.	N 0.10-0.30	2630-2680

 

Duplex Stainless Steel Investment Cast Alloy Properties

 

Duplex Stainless Steel Alloy Properties
	Condition	Tensile Strength		0.2% Yield Strength		% Elongation Range (2.5 cm or 1")	Hardness RB Max
Alloy Type		English PSI	Metric MPa	English PSI	Metric MPa
ASTM A890 Grade 1A CD4MCu	Solution Annealed	100,000 Min	689 Min	70,000 Min	483 Min	16% Min	94Rb – 27Rc
ASTM A890 Grade 4A CD3MN	Solution Annealed	90,000 Min	621 Min	60,000 Min	414 Min	25% Min	90 Rb – 25Rc

 

Mechanical Property values are for information only. They are determined from test bars and do not necessarily apply to castings. Any requirements for mechanical properties that are beyond the above information must be discussed with and agreed to by WPCC.

Cross-Index of Various Alloy Designations For Duplex Stainless Steel Investment Cast Alloys

 

Duplex Stainless Steel Alloy Cross-Index
Alloy or Type	AMS	Other Designation
CD4MCu		ASTM A890 Grade 1A
CD3MN		ASTM A890 Grade 4A