Certificates

WYJ031-2001                          250rMnSiA

1. The technology conditions apply to 8 ~ 60 mm thickness of rMnSiA 250 steel plate which military industrial use alloy steel.

2. The size, shape, weight and allow deviation

The steel plate size and shape, weight and deviation should be allowed to meet the provisions of the GB709-88.

3. Technical requirements

3.1 the chemical composition of the steel plate (melting analysis) should comply with the relevant provisions of the GB3077-88, see table 1 below.

Table 1                         WT％

 

C	Si	Mn	P	S	Cr
0.22～0.28	0.90～1.20	0.80～1.10	≤0.025	≤0.025	0.80～1.10

3.2 delivery status: normalized

3.3 mechanical properties

3.3.1 the mechanical properties of the steel plate should comply with the regulations of the table 2.

Chart 2

 

thickness （mm）	tensile strength σb (MPa)	elongation≥δ，％	BH（HB）
8～60	500～750	20	152～221

1.3.2.More than 20 mm thickness of steel, every increase 1 mm thickness, elongation at break allows a table 2 provisions reduce 0.25% (absolute value), but not more than 2%