Product Spec Guide:

				Composition %
	C(max)	Mn	P(max)	S(max)	Si	Ni
Grade 1	0.03	0.40 - 1.06	0.025	0.025
Grade 3	0.19	0.31 - 0.64	0.025	0.025	0.18 - 0.37	3.18 - 3.82
Grade 6	0.3	0.29 - 1.06	0.025	0.025	0.10 (min)

For each reduction of 0.01% carbon below 0.30%, an increase of 0.05% manganese above 1.06% would be permitted to a maximum of 1.35% manganese. When Grade 6 is ordered under this specification, supplying an alloy grade that specifically requires the addition of any element other than those listed for the ordered grade is not permitted. However, the addition of elements required for the deoxidation of the steel is permitted.

Impact Testing

Minimum Size of Specimen		Minimum Average Impact Value of Each Set of Three Specimens			Minimum Impact Value of One Specimen			Impact Temperature
		Foot Pounds	Joules		Foot Pounds	Joules		F	C
10 x 10		13	18		10	14		-50	-45
10 x 7.5		10	14		8	11		-150	-100
10 x 6.67		9	12		7	9		-50	-45
10 x 5		7	9		5	7
10 x 3.33		5	7		3	4
10 x 2.5		4	5		3	4

For Grades 1, 3 and 6, the notched-bar impact properties of each set of three impact specimens, including specimens for the welded joint in welded pipe with wall thicknesses of 0.120 in. [3 mm] and larger, shall not be less than the values prescribed: