Hot extrusion technological process for elbow from X80 grade steel plate

A process method and hot extrusion technology, applied in the field of elbow processing, can solve problems such as changes in metallographic structure and failure to meet standard requirements, and achieve the effects of preventing changes in metallographic structure, reducing heat, and heating uniformly

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

AI Technical Summary

Problems solved by technology

However, if the X80 grade steel material uses the current X70 grade steel material to process the elbow, it will not work, and its metallographic structure will change greatly, which will not meet the requirements of the Q / SY GJX0130-2008 standard

Method used

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Experimental program
Comparison scheme
Effect test

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. Hot press forming: the heating temperature cannot exceed 930°C, and the temperature of the blank entering the furnace is below 600°C;

[0019] 4. Flat film;

[0020] 5. For spot welding and welding, choose the appropriate welding rod. The chemical composition and mechanical properties of the welding rod are equivalent to or slightly higher than those of the base metal; the heating temperature of the base metal is determined thr...

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PUM

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Abstract

The invention discloses a technical process of an X80 steel plate hot extrusion elbow. The technical process comprises the following steps: (1) designing chemical compositions of raw materials, selecting proper X80 steel plates, controlling the grain size of the X80 steel plates at above 11 grade to basically comply with requirements of API SPEC 5L standard; (2) blanking; (3) hot press moulding, controlling the heating temperature within 930 DEG C and the temperature of workblank in a furnace lower than 600 DEG C; (4) planing sheets; (5) spot welding and welding, selecting suitable current and voltage, controlling the interlayer temperature within 200 DEG C, the current between 160A and 190A and the voltage at 30V; (6) planing ends, trimming 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 elbow.

Description

Technical field [0001] The invention belongs to a method for processing an elbow, in particular to a process method for hot-pressing an elbow of 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 completely adopts the current X70 grade steel material to process the elbow, it will not work, and its metallographic structure will undergo major changes, which will not meet the requirements of the Q / SY GJX0130-2008 standard. Conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/28C22C38/58
Inventor 韩连新祭立柱
Owner 河北恒通管件集团有限公司
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