Certificates

WYJ042-2001                    14Cr1MoR

1. The applicable scope

The technology conditions used in electric arc furnace + vacuum refining outside the furnace method of hydrogen and Cr1MoR the smelting of fine grain calm steel.

2. The size, shape, weight and allow deviation

The steel plate size and shape, weight and deviation should be allowed to meet ASME SA20/20 M of the provisions of the standard.

3. Technical requirements

4.1 chemical composition

The chemical composition of the steel plate should be in accordance with table 1

Chart 1               Wt％

 

composition	C	Si*	Mn*	P	S	Cr	Mo	Ni	Cu
heat analysis	≤0.17	0.50～0.80	0.40～0.65	≤0.010	≤0.012	1.00～1.50	0.45～0.65	≤0.20	≤0.20
product analysis	≤0.17	0.44～0.86	0.35～0.70	≤0.012	≤0.015	0.94～1.56	0.40～0.70	≤0.25	≤0.22

 

 

composition	Sb**	Sn**	As**	(H)**
heat analysis	≤0.003	≤0.015	≤0.016	≤2PPm
product analysis	≤0.003	≤0.015	≤0.016	≤2PPm

Note: (1) *controlSi, Mn's content close to the lower limit of specified range as far as possible.

(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 10-2 than 15 PPm

(type of element are in PPm content generation, such as 0.01% to the 100 PPm generation into.)

4.2 delivery status: the steel plate to normalized (allows cooling) + tempering state delivery. According to the agreement between the supply and demand, hot forming steel plate can also annealing or high temperature tempering state delivery, to sample for billet normalized(allows cooling) + tempering state + simulation welding heat treatment, sample size billet quartile 3 T ×3 T ×T (T for steel plate thickness).

4.3 mechanical properties

The mechanical properties of the steel plate section 4.3.1 should comply with the provisions of the table 2 (sample for simulation of heat treatment after welding state).

 

Chart 2

 

tensile strength σb MPa	yield σ0.2 MPa	elongation δ5 ％	cold bend inspection 180° b=2a	Atransverse impact AKV  J		reduction of areaψ ％	High tensileσ0.2 MPa
				+10℃	－10℃
516-690	≥310	≥22	C	≥54 (average value) ≥48 (single value)	≥27 (average value) ≥20 (single value)	≥45	B

 

 Note: when dong sample impact, shall be recorded lateral expansion value and fibrous fracture percentage for reference.

B the temperature and index high temperature stretching should indicated in the contract.

C thickness T≤25mm, d = 1.5 a;25mm≤T≤100mm，d＝2.0a；T＞100mm，d＝2.5a。

4.3.2 steel plate to each shipment for grain degrees inspection, grain degrees for more than 5 levels.