X70QS seamless line pipe with HIC (Hydrogen Induced Cracking) resistance
A seamless line pipe and performance technology, applied in the field of corrosion-resistant materials and seamless pipes, can solve the problems of wide composition range and no clear steel grade, and achieve the effect of high strength, good HIC resistance and high ductility
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[0009] The X70QS seamless line pipe with anti-HIC performance of the present invention will be described with reference to the drawings and examples.
[0010] In the X70QS seamless line pipe with HIC resistance of the present invention, the composition weight percent of the seamless line pipe is C 0.06-0.14%, Si 0.20-0.45%, Mn 1.00-1.30%, P≤0.015%, S≤0.003 %, Ni≤0.10%, Cu≤0.20%, Cr 0.05~0.30%, Mo 0.05~0.30%, Al 0.015~0.060%, N 0.003~0.010%, Nb 0.030~0.050%, V0.05~0.09%, Ca ≤0.060%, the balance is Fe and impurities; carbon equivalent CEpcm≤0.22%, CE IIW ≤0.39%.
[0011] Cr and Mo in the composition are alloying elements and V and Nb are microalloying elements, and the addition amount is Cr+Mo≥0.15%, Cr+Mo+Mn≤1.80%, V+Nb≥0.09%.
[0012] It has good HIC resistance under yield strength ≥ 485MPa, crack sensitivity rate CSR ≤ 2%, crack length rate ≤ 10%, crack thickness rate CTR ≤ 3%.
[0013] The specific optimized chemical composition of the present invention is described as fo...
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