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Heat-resistant seamless steel tube 12Cr1MoVG hot continuous rolling production method

A technology for seamless steel pipes and production methods, applied in the direction of rolling, metal rolling, metal rolling, etc., can solve problems such as safety accidents, poor dimensional accuracy, and unstable quality, and achieve promotion of extension, uniform flow direction, and stable product quality Effect

Inactive Publication Date: 2020-06-16
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Boiler enterprises are high-risk industries. At present, the design and materials of power plant boilers are under a lifelong responsibility system. Any small quality problems may cause major safety accidents. Cutting, bending and many subsequent machining, therefore, this requires 12Cr1MoVG heat-resistant seamless steel pipe to have good comprehensive performance, dimensional accuracy, internal and external surface quality and other requirements. At present, many high-pressure boiler tubes in my country are rolled by old-fashioned two-roll mills. The biggest feature is that the quality is not stable enough and the dimensional accuracy is poor

Method used

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  • Heat-resistant seamless steel tube 12Cr1MoVG hot continuous rolling production method

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Embodiment Construction

[0015] The above-mentioned technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments. The heat-resistant seamless steel pipe 12Cr1MoVG tube billet is the continuous casting round tube billet produced by Baotou Steel Tube Company. The chemical composition is as follows: C: 0.08-0.15%, Si: 0.17-0.37%, Mn: 0.40-0.70%, P: ≤0.025%, S: ≤0.015%, Cr: 0.90-1.20%, Mo: 0.25-0.35% , V: 0.15-0.30, the rest is Fe and unavoidable impurities. Specific steps are as follows:

[0016] Step 1: The heating temperature of the continuous casting round tube billet in each section of the ring furnace is as follows: heating stage 800°C→1000°C for 2-2.5 hours; heating stage 2 1000°C→1200°C for 2-2.5 hours; heating stage 3 1100°C→1250°C, time 1-2.5 hours; heating stage 4 1200°C→1300°C, time 1-2.5 hours; heating stage 5 1200°C→1300°C, time 1-2.5 hours; heating stage 6 1200°C→1300°C , time 1-2.5 hours.

[0017] Step 2: Before p...

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Abstract

The invention discloses a heat-resistant seamless steel tube 12Cr1MoVG hot continuous rolling production method. The hot continuous rolling production method comprises the specific technological processes of carrying out pipe blank sawing, carrying out steel pipe weighing, carrying out annular furnace heating, carrying out hot centering, carrying out fungoid perforating, carrying out borax blowingand oxidation resisting, carrying out operation through a five-rack three-roller PQF rolling mill, carrying out operation through a three-rack pipe stripping machine, carrying out operation through atwelve-rack sizing mill, carrying out online thickness measuring, carrying out online diameter measuring, carrying out operation through a cold bed, carrying out sawing through four pipe gang saws, carrying out dust blowing and sucking, carrying out vortex forming flow flaw detection, carrying out manual inspection, carrying out heat treatment, carrying out ultrasonic flaw detection, carrying outwater pressure, carrying out length measurement, carrying out weighing, carrying out mark spraying and carrying out warehousing in sequence. According to the hot continuous rolling production method,a heat-resistant seamless steel tube 12Cr1MoVG produced by using the method has excellent comprehensive mechanical properties and dimensional accuracy, and can completely meet various properties andmachining requirements of a boiler plant.

Description

technical field [0001] The invention relates to the technical field of continuous hot rolling of seamless steel pipes, in particular to a production method for continuous hot rolling of heat-resistant seamless steel pipes 12Cr1MoVG. Background technique [0002] The heat-resistant tube 12Cr1MoVG is widely used in superheaters, headers and main steam conduits of subcritical, supercritical and ultra-supercritical power plant boilers at home and abroad. The amount of 12Cr1MoVG heat-resistant seamless steel pipe used in boiler manufacturing is very large. The 12Cr1MoVG heat-resistant pipe accounts for almost 80% of the low-alloy steel pipe used in a high-pressure boiler; and the 12Cr1MoV G pipe in an ultra-high pressure boiler also accounts for almost all alloys. 30% of the steel pipe. With the development of the power energy industry, the steel pipe has a broad market prospect. Boiler enterprises are high-risk industries. At present, the design and materials of power plant bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B27/02B21B13/04B21B19/04B21B19/10B21B25/00B21B37/20B21B15/00C22C38/24C22C38/22C22C38/04C22C38/02C21D8/10C21D11/00
CPCB21B13/04B21B15/0007B21B19/04B21B19/10B21B25/00B21B27/02B21B27/025B21B37/20B21B2027/022B21C37/06C21D8/105C21D11/00C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 张行刚张昭郭志文石晓霞余泽金米永峰姜海龙陈镇方康利明
Owner BAOTOU IRON & STEEL GRP
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