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Processing technology for corrosion-resistant stainless steel seamless steel tube

A technology of seamless steel pipe and processing technology, which is applied in the field of pipe processing, can solve the problems of long delivery time and high price, and achieve the effect of short pickling time and good pickling effect

Active Publication Date: 2018-01-30
BAOFENG STEEL GRP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the country's stricter safety and environmental protection requirements and the transformation and upgrading of chemical equipment, the demand for B-3 alloy seamless steel pipes has grown rapidly; in addition, the processing experience of domestic Hastelloy seamless steel pipes is not mature enough. Especially for the forming of seamless steel pipes, most domestic enterprises do not have reliable and perfect processing technology and experience, most of the seamless steel pipes still need to be imported from abroad, the price is high and the delivery time is long

Method used

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  • Processing technology for corrosion-resistant stainless steel seamless steel tube
  • Processing technology for corrosion-resistant stainless steel seamless steel tube
  • Processing technology for corrosion-resistant stainless steel seamless steel tube

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Embodiment

[0031] A processing technology of Hastelloy B-3 seamless steel pipe, see the process flow figure 1 . The seamless steel pipe processing requirements are:

[0032]

[0033] 1 tube billet smelting

[0034] The smelting uses a 1-ton vacuum induction furnace + electroslag remelting, casting 380X380mm-340X340mm steel ingots, and diffusion annealing after the steel ingots are demoulded.

[0035] 2 tube blank forging

[0036] The temperature of the steel ingot entering the furnace is 850°C, and the holding time after reaching the temperature is at least 1.2min / mm. The heating is uniform, and the flame cannot touch the steel ingot to ensure that the steel ingot is completely burned through; heating times. The starting forging temperature is 1246°C, and the final forging temperature is not lower than 954°C.

[0037] 3 Machining waste tube

[0038] According to the chemical composition of Hastelloy B-3 alloy, the content of Ni, Mo and W is relatively high, and the deformation r...

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Abstract

The invention relates to a processing technology for a steel tube, particularly relates to a processing technology for a corrosion-resistant stainless steel seamless steel tube, and belongs to the technical field of tube processing. The processing technology for the corrosion-resistant stainless steel seamless steel tube comprises the following steps: (1) tube blank smelting, (2) tube blank forging, (3) machining of a pierced billet, and (4) steel tube deforming. A tube blank is subjected to repeated chambering and cold rolling treatment, and is processed by a multi-pass small deformation; andaccording to the final cold drawing procedure, processing of the seamless steel tube is finished by cold drawing, oil removal, annealing, straightening, fixed cutting, acid pickling and inspection toobtain the product. In a cold rolling process, the processing deformation of the seamless steel tube does not exceed 55%; in a chamfering process, the processing deformation of the seamless steel tube does not exceed 10%; in a cold drawing process, the processing deformation of the seamless steel tube does not exceed 15%; and an annealing process in the chamfering, cold rolling and cold drawing processes meets the conditions of solution annealing at the temperature of 1,052-1,093 DEG C and rapid cooling or water cooling.

Description

technical field [0001] The invention relates to a processing technology for steel pipes, in particular to a processing technology for corrosion-resistant stainless steel seamless steel pipes, and belongs to the technical field of pipe material processing. Background technique [0002] (UNS N10675) is a new nickel-chromium-molybdenum-tungsten alloy material, the material is in Improved on the basis of alloy materials, compared to It improves the thermal stability and corrosion resistance of the material, and improves the hot forming and cold working performance. Widely used in the chemical industry, especially in pure acid reaction vessels and acid recovery projects. In recent years, with the country's stricter safety and environmental protection requirements and the transformation and upgrading of chemical equipment, the demand for B-3 alloy seamless steel pipes has grown rapidly; in addition, the processing experience of domestic Hastelloy seamless steel pipes is no...

Claims

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Application Information

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IPC IPC(8): B21C37/06C21D8/10
Inventor 郑兴
Owner BAOFENG STEEL GRP
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