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Production method for high-precision austenite seamless steel pipe

A seamless steel pipe and austenite technology, applied in the metallurgical field, can solve the problems of complex processing procedures, polluted environment by pickling, and high cost, and achieve the effects of simplifying procedures, reducing pollution, and shortening production cycles.

Active Publication Date: 2013-12-25
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the existing TP347H seamless steel pipe has complex processing procedures, and there are problems such as high cost, low output and environmental pollution by pickling

Method used

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  • Production method for high-precision austenite seamless steel pipe
  • Production method for high-precision austenite seamless steel pipe
  • Production method for high-precision austenite seamless steel pipe

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Embodiment 1

[0021] According to the ASTM SA-312 standard "Seamless and Welded Austenitic Stainless Steel Pipe" to produce TP347H austenitic stainless steel seamless pipe with a specification of Φ189×12.6. Specifically, the production process used is: electric furnace steelmaking→forging 220 billet→ring furnace heating→cross-rolling piercing→precision pipe rolling mill rolling tube→sizing→reheating solid solution→water cooling to room temperature→straightening→flaw detection , water pressure, inspection, packaging. Among them, the furnace temperature in the soaking section of the annular furnace is 1150 °C, the perforated plug is made of 20CrNi3WCoMo alloy steel, and the perforated hole is a Φ249×16.5 capillary tube; the roll distance of the rolling mill of the precision pipe mill is 222mm, the lead distance is 243mm, and the feed angle is 6° , the rolling angle is 13.5°, the exit speed is 0.35 m / s, hot-rolled into Φ245×13 waste pipes; after being sized into Φ189×12.6 finished steel pipes ...

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Abstract

The invention discloses a production method for a high-precision austenite seamless steel pipe. The method comprises the following steps: heating of a circular pipe blank; cross piercing; pipe rolling with a precision pipe mill; sizing; and on-line solid solution treatment; wherein the heating temperature of the circular pipe blank is 1100 to 1200 DEG C, an alloy steel ejector header is employed in cross piercing, the precision pipe mill is used for pipe rolling, parameters of the precision pipe mill comprise a feeding angle of 5 to 6 DEG, a rolling angle of 13 to 14 DEG and ovality of 1.09 to 1.1, two-roller sizing is adopted for sizing, on-line solid solution heating is carried out in a re-heating furnace with a heating temperature being 1060 to 1080 DEG C and insulation time being 1.5 to 2.5 min per one-cm-thick steel pipe wall, and water cooling is used for solid solution cooling. According to the invention, the procedures of cold rolling and cold drawing are omitted, piercing, rolling and heat treatment are carried out in a hot rolling mill, so the purposes of simplification of working process, decrease of cost, shortening of a production period and reduction in pollution are achieved and production efficiency is greatly increased.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular, the invention relates to a method for producing high-precision austenitic seamless steel pipes. Background technique [0002] TP347H is a low-carbon chromium-nickel-niobium austenitic stainless steel. Because it contains stabilizing element Nb, it has good intergranular corrosion resistance, so it is widely used in industries such as boilers, power generation, petroleum, chemical industry, synthetic fiber, food and papermaking. [0003] The production of high-precision TP347H austenitic seamless steel pipes generally adopts a multi-pass cold rolling or cold drawing process after hot piercing of round tube blanks. However, due to the limited amount of deformation in each pass, multiple passes of cold rolling or cold drawing are often required to produce finished products. The production process of each pass of cold rolling includes: inspection of steel pipe → head cutting, cutting → annea...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21B25/00B21B37/74B21B27/02C21D8/06
Inventor 江健尹人洁张涛童宗圣陈雨
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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