ASTM A543 / A543M Type B Class 1

Chemical Properties

Carbon	Manganese	Phosphorus,max	Sulfur,max	Silicon	Nickel	Chromium	Molybdenum
0.20	0.40	0.020	0.020	0.13–0.45	2.18–4.07	0.94–1.96	0.16–0.69

Note: A Applies to both heat and product analyses.

Mechanical Properties

Class	Tensile strength,min: ksi [MPa]	Yield strength,min: ksi [MPa]	Elongation in 2 in. [50 mm] min, %A,B
Class 1	105–125 [725–860]	85 [585]	14

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