The large-diameter coated steel pipe is made of plastic-coated large-diameter SSAW steel pipe and ERW steel pipe. The maximum nozzle diameter is 1200mm.

Quenching and tempering refers to a heat treatment process used to improve the comprehensive mechanical properties of seamless steel pipes. That is, after quenching, it is subjected to high temperature tempering treatment. The purpose is to make the seamless steel pipe obtain a good combination of strength and toughness, which not only has high strength, but also has excellent toughness, plasticity, and cutting performance.

Oil country pipe, also known as oil special pipe, is the basic casing, oil pipe and drill string components (drill pipe, drill collar, kelly, etc.) of the petroleum industry. Collectively called oil country pipe (OCTG), it is a series of seamless pipe products.

Thin-walled stainless steel seamless pipes refer to stainless steel pipes with a ratio of wall thickness to outer diameter not greater than 6%. Mainly used for building water supply pipes.

Wear-resistant steel pipe is a steel pipe made of steel plate or steel strip after crimping and welding. The production process of the wear-resistant pipe is simple, the production efficiency is high, the variety and specifications are many, and the equipment capital is low, but the general strength is lower than that of the seamless steel pipe.

The initial impact property reflects the ability of the material to resist impact load. The practical significance of the impact toughness index is to reveal the brittle tendency of the material, which is generally measured by impact tests.