High-strength steel

Abstract

The invention relates to high-strength steel. The problem that existing steel is not resistant to low temperature and poor in H2S corrosion resistance is mainly solved. The high-strength steel is mainly composed of Fe and comprises, by weight, 0.08-0.19% of C, 0.15-0.41% of Si, 1.35-2.18% of Mn, less than or equal to 0.01% of S, less than or equal to 0.025% of P, 0.06-0.15% of Ni, 0.01-0.04% of Ti, 0.035-0.070% of Nb and less than or equal to 0.25% of CE. The high-strength steel has the advantages of being high in steel grade, low in carbon content and high in impact toughness, H2S corrosion resistance and low temperature resistance.

Description

Technical field: [0001] The invention relates to a high-strength steel. Background technique: [0002] Existing steel is widely used. The strength and plasticity of X60 steel in API I 5LPSL2 standard can meet the product requirements, but it is not resistant to low temperature and has poor H2S corrosion resistance. Freeze cracking or pipe burst accidents due to corrosion often occur. Invention content: [0003] The technical problem to be solved by the present invention is to provide a high-strength steel with strong H2S corrosion resistance and low temperature resistance. [0004] The above-mentioned purpose is achieved like this: its chemical composition is based on Fe, and the percentage of other metal elements accounting for the total weight is: C 0.08%-0.19%, Si0.15%-0.41%, Mn1.35%-2.18%, S ≤0.01%, P ≤0.025%, Ni0.06%-0.15%, Ti 0.01%-0.04%, Nb0.035%-0.070%, CE ≤0.25%. [0005] The production method of the steel is to adopt electric furnace+VD furnace or converter+VD ...