Chemical composition and strength of 15MnNiNbDR steel sheet

15MnNiNbDR is a steel plate for pressure vessels, executive standard: GB3531-2014

Chemical composition of 15MnNiNbDR steel sheet:
C:≤0.18; Si: 0.15-0.50; Mn: 1.20-1.60; P:≤0.020; S:≤0.010; Ni: 0.30-0.70; Nb: 0.01-0.04; Al:≤ 0.015; Cr:≤ 0.45.

Mechanical properties of 15MnNiNbDR steel plate:
Tensile strength of 15MnNiNbDR steel plate:
8-16mm: 530-630;
16-36mm: 530-630;
36-60mm: 520-620;

Yield strength of 15MnNiNbDR steel plate:
8-16mm: ≥370;
16-36mm: ≥360;
36-60mm: ≥350;

15MnNiNbDR steel plate impact test:
15MnNiNbDR steel sheet impact temperature: -50℃
-50 impact test: 8-60mm≥60J
Bending test 180°8-60mm = d=3a
Elongation after break A/: 20