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A single-layer wear-resistant seamless steel pipe for concrete pump truck and its manufacturing method

A technology for concrete pump trucks and seamless steel pipes, which is applied in the field of seamless steel pipe production, can solve problems such as poor crack resistance, poor wear resistance and poor toughness of steel pipes, achieve good wear resistance, and reduce low-temperature tempering processes , The effect of shortening the process flow

Active Publication Date: 2021-07-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the pure martensitic structure has high hardness, it has poor toughness and poor crack resistance. Under the condition of impact load, the steel pipe has poor wear resistance.

Method used

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  • A single-layer wear-resistant seamless steel pipe for concrete pump truck and its manufacturing method
  • A single-layer wear-resistant seamless steel pipe for concrete pump truck and its manufacturing method

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Embodiment Construction

[0028] The specific embodiment of the present invention will be further described below in conjunction with embodiment:

[0029] A single-layer wear-resistant seamless steel pipe for concrete pump trucks, the chemical composition of the steel contains: 0.50% to 0.60% of C, 0.15% to 0.35% of Si, 0.60% to 0.90% of Mn, and 0.25% to Cr 0.50%, Ti0.010%~0.030%, the balance is Fe and unavoidable impurities.

[0030] The inner surface of the finished steel pipe has a mixed structure of martensite + troostite, the thickness of the mixed structure reaches 2-3.5mm, and the hardness value is HRC55-62. The hardened structure is a mixed structure of martensite and troostite, troostite accounts for 40%-60% of the mixed structure, the structure is better than pure martensite, the hardness of the hardened layer reaches HRC55-62, and the structure It has a certain toughness. Compared with the simple martensitic hardened layer, it reduces the cracks on the inner surface of the steel pipe due to...

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Abstract

A single-layer wear-resistant seamless steel pipe for concrete pump trucks and its manufacturing method. The chemical composition in the steel contains: C 0.50%-0.60%, Si 0.15%-0.35%, Mn 0.60%-0.90%, Cr 0.25% to 0.50%, Ti 0.010% to 0.030%, and the balance is Fe and unavoidable impurities. Compared with the prior art, the beneficial effects of the present invention are: 1) The present invention makes the steel pipe have a certain strength and hardness by controlling the ratio of C and Mn elements, and at the same time, makes the steel pipe structure form martensite during induction hardening It is a mixed structure with troostite, and the thickness of the hardened layer is thick. 2) The manufacturing process of the product of the present invention is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of seamless steel pipe production, and in particular relates to a single-layer wear-resistant seamless steel pipe for a concrete pump truck and a manufacturing method thereof. Background technique [0002] Pumped concrete refers to the ready-mixed concrete that is transported along the conveying pipeline under the pressure of the concrete pump and poured directly at the outlet of the pipeline. The conveying pipeline of the concrete pump truck adopts a large number of wear-resistant seamless pipes whose inner surface has been quenched. There are many varieties of seamless pipes for conveying mortar developed, produced and used in my country in the past ten years. There are two main types of seamless steel pipes for cement concrete transportation: single-layer wear-resistant pipes and inner layer wear-resistant pipes of double-layer metal composite pipes. Mill seamless pipe. [0003] The single-layer wear-resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/28C21D8/10C22C33/04
CPCC21D8/105C21D2211/00C21D2211/008C22C33/04C22C38/02C22C38/04C22C38/28
Inventor 袁琴赵波王善宝吴红解德刚刘祥谷大伟王施文孟祥伟
Owner ANGANG STEEL CO LTD
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