WYJ036 –2006                 20MnMoNi55

1. applicable scope

The technology conditions apply to thickness is no more than the 120 mm steel production and inspection.

2. The size of the steel plate, appearance, weight and allow deviation conform to the provisions of the GB6654-96.

3. Technical requirements

3.1 chemical composition (melting analysis) should be in accordance with table 1

Table 1chemical composition（Wt％）

3.2 delivery status:normalized(allows cooling) and backfiring

3.3Ultrasonic testing according to Sel072- by 77, 3 class qualified.

3.4 the mechanical properties of the steel plate should comply with the provisions of the table 2

Table 2Mechanics performance requirements

3.5rolling and inspectionone by one , sampling location, inspection method according to the rules and regulations of the GB6654-96.

4Matters not execute GB6654-96 standard policy。