09MnNiDR steel plate meaning and chemical composition

09MnNiDR steel meaning, "D" is the first letter of low temperature, "R" is the first letter of pressure vessel. 09MnNiDR steel plate belongs to steel for low temperature pressure vessel.  

Delivery status of 09MnNiDR steel plate: normalizing or normalizing+tempering, -70 ℃ low temperature impact.

09MnNiDR steel plate executive standard: GB3531-2014.

Chemical composition of 09MnNiDR steel plate:
C≤0.12; P≤0.02; S: ≤0.015; Ni: 0.3-0.8; Si: 0.15-0.5; Mn: 1.2-1.6；
Cr≤0.25; Mo≤0.08; Cu≤0.25; Nb≤0.04; Als≥0.015.
Composition remarks: Cr, Mo and Cu are residual elements; It is allowed to add trace elements V, Ti, Nb, B and RE; Alt can be used instead of Als. At this time, Alt ≥ 0.02.