Certificates

WYJ051-2004                   SA387Cr11C12

1.application scope:

The technology conditions apply to no more than 120 mm thick SA387Cr11C12 steel plates.

2. The size, shape, weight and allow deviation

The steel plate size and shape, weight and deviation should be allowed to meet ASEM SA20/20 M standard rules

3. Technical requirements:

3.1 chemical composition

 

composition	C	Si*	Mn*	P	S	Cr	Mo
Melting analysis	≤0.17	0.50～0.80	0.40~ 0.65	≤0.010	≤0.012	1.00~ 1.50	0.45~ 0.65
Production analysis	≤0.17	0.44～0.86	0.35~ 0.70	≤0.012	0.015	0.94~ 1.56	0.40~ 0.70

 

 

composition	Ni	Cu	Sb**	Sn**	As**	[H]**
Melting analysis	≤0.20	≤0.20	≤0.003	≤0.015	≤0.016	≤2PPm
Production analysis	≤0.25	≤0.22	≤0.003	≤0.015	≤0.016	≤2PPm

Note: (1) * Si, Mn's content asfar as possiblecontrol it close to the lower limit of specified range.

(2) * * residual trace element analysis results only for record, does not make the acceptance conditions.

(3) smelting furnace, finished product analysis according to analysis by rolling a sampling inspection.

(4) the tempering embrittlement of full sensitivity (X) should meet the following requirements:

X = (10 P + 5 Sb + 4 Sn + As) X 102 than 15

(type of element are to weight percent generation, such as 0.010% to 0.010)

3.2 delivery status: the steel plate to normalized(allows cooling) + tempering state delivery.

3.3 mechanical properties

3.3.1By Zhang mechanical properties of steel  track inspection, mechanical properties should be consistent with the provisions of the table 2 (sample for simulating the thick welding heat treatment state)

table2

 

tensile strength Rm（MPa）	yield Rel（Mpa）	elongation A（％）	cold impact test 180°b＝2a	transverse impact Akv（J）		percentage reduction of area Z（％）
				+10℃	－20℃
515～690	≥310	≥22	d＝2a	≥54(average)≥48(single)	≥43(average≥34(Single	≥45

Note: A impact test, shall be recorded lateral expansion value and fibrous fracture percentage for reference.

B high temperature stretch: 38 mm do 450 ℃high temperature tensile test, Rp0.2 quartile 218.87 Mpa;

67 mm do 340 ℃high temperature tensile test, Rp0.2 quartile 239.2 Mpa;

73 mm do 300 ℃high temperature tensile test, Rp0.2 quartile 245.7 Mpa;

3.3.2 each shipment for grain size of the steel plate for inspection, grain degrees above level 5.