Hot extrusion technological process for three-way from X80 grade steel plate

A process method, hot extrusion technology, applied in the technical field of X80 grade steel plate hot extrusion tee, can solve the problems of not meeting the standard requirements, metallographic structure changes, etc., to reduce heat and prevent metallographic structure changes , Improve the effect of impact toughness

Active Publication Date: 2009-07-08
河北恒通管件集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the X80 grade steel material is completely used to process the tee of the pipe fittings with the current X70 grade steel material, it will not work, and its metallographic structure will change greatly, and it will not meet the requirements of the Q / SY GJX0130-2008 standard

Method used

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Experimental program
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Embodiment

[0015] Embodiment: the present invention takes following technology:

[0016] 1. Design the chemical composition of raw materials, select the appropriate X80 grade steel plate, its carbon equivalent CEpc≤0.23%, the C content is controlled within 0.07-0.10%, the Mn content is 1.5-1.8%, and the Si content is 0.20-0.25%. The Cr content is 0.13%, the Mo content is 0.25%, the V content is 0.035%, the Ni content is 0.04%, the Nb content is 0.06%, and the Cu content is 0.15%. The grain size is controlled at grade 11 or above;

[0017] 2. Cutting;

[0018] 3. For spot welding and welding of coiled pipes, select suitable electrodes. The chemical composition and mechanical properties of the electrodes are equivalent to or slightly higher than those of the base metal; the heating temperature of the base metal is determined through simulation tests, and the appropriate current and voltage are selected. Over 200°C, current between 160A ~ 190A, voltage 30V, welding speed 15 ~ 18cm / min;

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PUM

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Abstract

The invention discloses a technical process of an X80 steel plate hot extrusion tee. The technical process comprises the following steps: (1) designing chemical compositions of raw materials, selecting agreeable X80 steel plates, controlling the grain size of the X80 steel plates at 11 grade or above; (2) blanking; (3) reel pipe spot welding, selecting agreeable welding rods the chemical compositions and mechanical properties of which are equivalent to or slightly higher than those of a parent material, controlling the interlayer temperature within 200 DEG C, the current between 160A and 190A and the voltage at 30V; (4) flattening; (5) hot press moulding, controlling the heating temperature within 930 DEG C and the temperature of workblank in a furnace lower than 600 DEG C; (6) opening holes for drawing, trimming and shaping and detection; (7) hot treatment, putting welding seams at the same heated layer when a plurality of parts are simultaneously treated in a furnace; and (8) surface cleaning, end part processing and finished product detection. The technical process selects the raw materials with agreeable chemical compositions, reduces the current and the voltage, improves the welding speed and reduces the heat quantity during processing procedures, thus preventing the augmentation of grains and meeting the requirements of the X80 steel plate hot extrusion tee.

Description

Technical field [0001] The invention belongs to a method for processing a tee, in particular to a process method for hot extruding a tee with an X80 grade steel plate. Background technique [0002] At present, in the steel market, X70 grade steel materials have become more popular and widely used in the production of pipe fittings. The X80 grade steel material is still a new material, and it is rarely used in China, especially. Because the strength of X80 grade steel is higher than that of X70 grade steel, the use of X80 grade steel pipes and fittings in oil and gas transmission projects will improve the gas transmission capacity and enhance the safety and stability of the gas transmission process. However, if the X80 grade steel material is completely used to process the tee of the pipe fittings with the current X70 grade steel material, it will not work, and its metallographic structure will undergo a major change, which will not meet the requirements of the Q / SY GJX0130-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/29C22C38/58
Inventor 韩连新祭立柱
Owner 河北恒通管件集团有限公司
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