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What is the meaning of N in SA516 Gr70 N steel

What is the meaning of N in SA516 Gr70 N steel
May 10, 2022

SA516 Gr70 N steel

SA516 Gr70 plate is a carbon steel plate for medium and low temperature pressure vessels, which complies with ASME standards.

SA516 Gr70 steel chemical composition WT (%)

SA516 Gr70 C Si Mn P≤ S≤ Cu Ni Cr Mo V Nb Ti Alt
Smelting analysis ≤0.28 0.15-0.40 0.85-1.20 0.035 0.035 ≤0.40 ≤0.40 ≤0.30 ≤0.12 ≤0.03 ≤0.02 ≤0.03 ≥0.020
Product analysis ≤0.28 0.13-0.45 0.79-1.30 0.035 0.035 ≤0.43 ≤0.43 ≤0.34 ≤0.13 ≤0.04 ≤0.03 ≤0.04 ≥0.020

SA516 Gr70 steel plate is a hot-rolled plate. For SA516 Gr70 N steel, N indicates that it is a normalized plate, which means there is one more normalizing heat treatment. In comparison, normalizing is to refine the grain and homogenize the distribution of carbides, remove the internal stress of the material and reduce the hardness of the material. The toughness of the material will be improved, which will improve the low-temperature performance. The comprehensive performance has been improved, and the price is also expensive.

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