WYJ021-2006                 50Mn2Nb

1. The sample range

The technology conditions apply to for yichang black tornado saw industry limited company thickness not more than 20 mm of 50 Mn2Nb steel plates.

2. The size of the steel plate, appearance, weight and allow deviation

2.1 the thickness of the steel plate biggest negative deviation: _0.4 mm, the most-positive deviation: + 3.0 mm;

2.2 steel plate neat edge rolling, cut the head and tail, don't cut bilateral, bilateral surplus 30 to 100 mm;

2.3 the rest of 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 be in accordance with table 1.

Table 1  　          Wt％

3.2. delivery status : hot rolling

3.3. steel plate not do mechanical property and technology property inspection.