Ultralow-temperature, large-diameter and WPHY80-level steel plate special for three-way pipe fitting and production method of steel plate

A technology of tee fittings and large diameter, which is applied to the special steel plate for ultra-low temperature and large diameter WPHY80 grade tee fittings and its preparation field, can solve the problems of residual stress of steel plate, deterioration of welding performance of steel plate, decrease of crack resistance of weld seam, etc. Low temperature toughness performance and weldability, improving molten steel purity, and the effect of excellent welding performance
CN104894492AInactive Publication Date: 2015-09-09SHANDONG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANDONG IRON & STEEL CO LTD
Publication Date
2015-09-09
Estimated Expiration
Not applicable · inactive patent
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Abstract

The invention belongs to the technical field of low-alloy and high-strength pipeline steel and particularly relates to an ultralow-temperature, large-diameter and WPHY80-level steel plate special for a three-way pipe fitting and a production method of the steel plate. The steel plate comprises, by weight percentage, 0.04-0.06% of C, 0.50-0.80% of Si, 1.40-1.80% of Mn, not more than 0.008% of P, not more than 0.002% of S, 0.08-0.12% of Nb, 0.04-0.06% of Ti, 0.30-0.40% of Mo, 0.12-0.20% of Cu, 0.30-0.40% of Ni, not more than 0.50% of Cr, 0.050-0.060% of V, not more than 0.0005% of B, and the balance of iron and inevitable impurities. Under the premise that field production efficiency is increased, the produced steel plate is stable in performance, the steel plate has excellent low-temperature drop weight tear test performance: -25 DEG C SA%>=90% and excellent Charpy impact performance: -60 DEG C Charpy impact energy>=260J, -80 DEG C Charpy impact energy>=210J.
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Description

technical field

[0001] The invention belongs to the technical field of low-alloy high-strength pipeline steel, and in particular relates to a special steel plate for ultra-low temperature large-diameter WPHY80 grade tee pipe fittings and a preparation method thereof. Background technique

[0002] With the development of pipelines towards high transmission efficiency, low energy consumption, low cost, large diameter, large thickness and high strength and toughness, the geological environment of pipeline steel service is becoming more and more complex, and the quality requirements for pipeline steel are also getting higher and higher. In order to transport liquid or gas resources such as oil and natural gas smoothly and completely, various pipelines must be used. In addition to steel pipes for straight pipelines, a large number of accessories for straight pipes are also used in pipeline laying. Tee pipelines are important as oil and gas transmission pipelines. The components a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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