Ageing strengthening type iron nickel base corrosion resistant alloy easily processed into thick-walled seamless tube

A technology of age-strengthening and corrosion-resistant alloys, applied in the field of alloys, can solve the problems of high hardening rate, narrow high-temperature deformation temperature, poor thermoplasticity, etc., and achieve the effects of improved thermal processing performance, strong resistance to stress corrosion cracking, and high strength

Active Publication Date: 2016-04-13
CHONGQING MATERIALS RES INST
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Problems solved by technology

However, the alloy content of iron-nickel-based alloys is still very high, and there are also problems such as too narrow high-temperature deformation temperature, poor thermoplasticity, and excessive hardening rate. Therefore, there are still high-performance iron-nickel-based alloy seamless pipes on the market. "The situation, thick-walled tubes can only be obtained by mechanical drilling

Method used

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  • Ageing strengthening type iron nickel base corrosion resistant alloy easily processed into thick-walled seamless tube
  • Ageing strengthening type iron nickel base corrosion resistant alloy easily processed into thick-walled seamless tube

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Embodiment 5

[0038] Vacuum induction melting alloy 1000kg, the composition is as follows: Ni: 43.7%, Cr: 23.6%, Mo: 3.55%, Cu: 1.78%, Ti: 2.23%, Al: 0.28%, V: 0.025%, Zr: 0.029% , B: 0.0025%, Mg: 0.015%, Nb: 0.36%, C: 0.032%, Si: 0.25%, Mn: 0.32%, Fe: balance. The alloy is cast into a Φ220mm round bar, and then electroslag remelted into a Φ380mm steel ingot, placed in a high-temperature pit furnace for homogenization heat treatment, and then made into a Φ230mm round bar by upsetting, and the bar is machined. Extrude the tube billet, and then make a thick-walled seamless tube of Φ108×22mm by hot extrusion. After the above-mentioned solution heat treatment and double-stage aging heat treatment, a qualified product is produced, and finally machined into a packer for a gas field in eastern Sichuan. .

Embodiment 6

[0040]Vacuum induction melting alloy 3000kg, the composition is as follows: Ni: 42.4%, Cr: 22.75%, Mo: 2.45%, Cu: 2.67%, Ti: 1.83%, Al: 0.48%, V: 0.041%, Zr: 0.019% , B: 0.003%, Mg: 0.013%, Nb: 0.43%, C: 0.04%, Si: 0.32%, Mn: 0.46%, Fe: balance. The alloy is cast into a Φ300mm round bar, then electroslag remelted into a Φ500mm steel ingot, and then placed in a high-temperature pit furnace for homogenization heat treatment, and then subjected to upsetting, drawing, and long blanking by a fast forging machine, and forging by a radial forging machine. It is made into a Φ230mm round bar, processed into an extruded tube billet, and then hot-extruded into a Φ200×30mm thick-walled seamless pipe. After the above-mentioned solution heat treatment and double-stage aging heat treatment, a qualified product is produced, and finally It is machined into a downhole pipe hanger and used in a sour oilfield in Xinjiang.

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Abstract

The invention relates to an ageing strengthening type iron nickel base corrosion resistant alloy easily processed into a thick-walled seamless tube. The alloy comprises the following components by weight percent: 40-45% of Ni, 20-25% of Cr, 2-5% of Mo, 1-3% of Cu, 1.5-3% of Ti, 0.1-0.5% of Al, 0.01-0.5% of V, 0.001-0.05% of Zr, 0.001-0.005% of B, 0.005-0.05% of Mg, 1.0% or less of Nb, 0.05% or less of C, 0.5% or less of Si and 0.5% or less of Mn, with the balance being Fe. According to the alloy, the hot working plasticity of the alloy can be improved, the heat checking tendency during the hot working process is reduced, the strength is high, the toughness and plasticity are good, the corrosion resistance is good, and the comprehensive performance is good.

Description

technical field [0001] The invention relates to an alloy, in particular to an age-strengthened iron-nickel-based corrosion-resistant alloy which can be easily processed into thick-walled seamless pipes. Background technique [0002] Generally, nickel-based structural materials contain beneficial elements such as chromium, molybdenum, niobium, tungsten, copper, titanium and aluminum in addition to the matrix element nickel. Nickel-based alloys can be divided into solid solution strengthening type and aging strengthening type according to the strengthening method. The former can increase the strength through cold working, but cannot manufacture larger and complex parts. In contrast, age-strengthened alloys have no such limitations, and can be made into larger parts with higher strength through aging heat treatment, so they have been widely used in many important industrial fields. [0003] From the perspective of composition, nickel-based superalloys and corrosion-resistant a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02
CPCC22C19/05C22C30/02
Inventor 王东哲刘海定王春光黄国平李永友吴畏万红祁宏董盼
Owner CHONGQING MATERIALS RES INST
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