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Strength: 10.9S
Material: carbon steel, alloy steel Material: 20MnTiB
Material description: C 0.17-0.24, Si0.17-0.37，Mn1.30-1.60,Ti0.04-0.10,B0.0005-0.0035,P≤0.035，S≤0.035，CU≤0.30，Cr≤0.30，Ni≤0.30,Mo≤0.15， Its composition is similar to Russian 20XTHTP, but there is no similar steel grade in the United States, Britain, Germany, and France
Surface treatment: Blackening (quenching)
Surface treatment content: Blackening is a common method of metal heat treatment, which is to create a layer of oxide film on the metal surface to isolate air and achieve the purpose of rust prevention. When the appearance requirements are not high, blackening treatment can be used, and the surface of steel parts can be blackened, also known as bluing.
Risk reminder: Products with fastener performance level ≥ 10.9 may have a risk of hydrogen embrittlement during electroplating!
