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High-strength hydrogen-brittleness-resistant austenite alloy with mark of J75 and preparation method of high-strength hydrogen-brittleness-resistant austenite alloy

A high-strength, hydrogen-embrittlement-resistant technology, applied in the field of precipitation-strengthened austenitic alloys, can solve the problems of limited application range and low strength, achieve moderate grain size, excellent hydrogen embrittlement resistance, impurity elements and non-metallic inclusions The effect of low content

Active Publication Date: 2015-11-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it should be pointed out that the austenitic alloys currently used in hydrogen-facing environments in China are all single-phase austenitic alloys (such as: 316L, 304N, etc.), although their plasticity, processing and hydrogen resistance at room temperature are good, but their strength Low (yield strength is 200 ~ 450MPa level), resulting in the use of this type of alloy is limited

Method used

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  • High-strength hydrogen-brittleness-resistant austenite alloy with mark of J75 and preparation method of high-strength hydrogen-brittleness-resistant austenite alloy
  • High-strength hydrogen-brittleness-resistant austenite alloy with mark of J75 and preparation method of high-strength hydrogen-brittleness-resistant austenite alloy
  • High-strength hydrogen-brittleness-resistant austenite alloy with mark of J75 and preparation method of high-strength hydrogen-brittleness-resistant austenite alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: Specification is the J75 alloy rolling bar of Φ65mm

[0040] CaO crucible is used to melt the alloy on a 1.0-ton vacuum induction furnace. During the melting process, a refining and a refining desulfurization treatment are carried out, and then the ingot is cast; After treatment, forging and rolling are carried out to prepare alloy rods with a specification of Φ65 mm. The chemical composition is shown in Table 1. The preparation process is as follows:

[0041] 1. With phosphorus content lower than 0.007wt.% industrial pure iron (0.006wt.% in this embodiment), electrolytic nickel, metal chromium, metal molybdenum and other intermediate alloys (such as: ferrosilicon, ferrosilicon, aluminum iron, boron Fe, Ni, Cr and Mo are loaded into the crucible before smelting, and ferrosilicon, ferro-titanium, ferro-aluminum, ferro-boron, ferro-vanadium and calcium desulfurizer are loaded into the hopper.

[0042] 2. Use a CaO crucible for vacuum induction melting, refi...

Embodiment 2

[0065] Example 2: J75 alloy rolled bar with a specification of Φ85mm

[0066] The difference from Example 1 is that the prepared J75 alloy rod has a specification of Φ85 mm.

[0067] Using a CaO crucible, in a 1.0-ton vacuum induction furnace, use industrial pure iron with a phosphorus content of 0.006wt.%, electrolytic nickel, metal chromium, metal molybdenum and other intermediate alloys (such as: ferrosilicon, ferro-titanium, ferro-aluminum, ferro-boron, Ferrovanadium) as raw material for melting alloys. During the smelting process, refine at 1530°C for 12 minutes first, then add ferrosilicon, ferrotitanium, ferroaluminum, ferroboron, ferrovanadium and calcium desulfurizer in sequence, refine again for 12 minutes, and cast ingots at 1500°C, see alloy composition Table 6. The ingot is vacuum self-consumed remelting, and the specification of the consumable ingot is Φ340mm. The consumable ingot is forged after being held at 1140°C for 8 hours. The billet forging is at 1120°...

Embodiment 3

[0079] Example 3: J75 alloy forged bar with a specification of Φ110mm

[0080] The difference from Example 1 is that the prepared J75 alloy bar has a specification of Φ110 mm, and the bar is formed by forging.

[0081] Using a CaO crucible, in a 1.0-ton vacuum induction furnace, use industrial pure iron with a phosphorus content of 0.006wt.%, electrolytic nickel, metal chromium, metal molybdenum and other intermediate alloys (such as: ferrosilicon, ferro-titanium, ferro-aluminum, ferro-boron, Ferrovanadium) as raw material for melting alloys. During the smelting process, refine at 1540°C for 12 minutes, then add ferrosilicon, ferrotitanium, ferroaluminum, ferroboron, ferrovanadium and calcium desulfurizer in sequence, refine again for 12 minutes, and cast ingots at 1500°C, see alloy composition Table 11. The ingot is vacuum self-consumed remelting, and the specification of the consumable ingot is Φ315mm. The consumable ingot is forged after being held at 1140°C for 6 hours....

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Abstract

The invention relates to the field of precipitation strengthening austenite alloy, in particular to high-strength hydrogen-brittleness-resistant austenite alloy with the mark of J75 and a preparation method of the high-strength hydrogen-brittleness-resistant austenite alloy. The high-strength hydrogen-brittleness-resistant austenite alloy comprises, by weight, 0.0008-0.0025% of B, smaller than or equal to 0.020% of C, smaller than or equal to 0.006% of S, smaller than or equal to 0.006% of P, 0.10-0.30% of Si, 29.00-32.00% of Ni, 13.50-16.50% of Cr, 1.00-1.60% of Mo, 0.15-0.35% of V, 1.80-2.40% of Ti, 0.10-0.40% of Al, and the balance Fe. The alloy is formed by forging and / or rolling through vacuum induction and vacuum arc self-consuming smelting, hot-rolled bars with the diameters not larger than 80 mm is not lower than level 6, and hot-rolled bars and forged materials with the diameters larger than 80 mm are not lower than the level 5. The inspection result of bars with the diameters not larger than 65 mm needs to conform to the AA-level specification in GB / T 4162, and the inspection result of bars with the diameters larger than 65 mm needs to conform to the A-level specification in GB / T 4162.

Description

technical field [0001] The invention relates to the field of precipitation strengthening austenitic alloys, in particular to a J75 high-strength hydrogen embrittlement-resistant austenitic alloy and a preparation method thereof. Background technique [0002] Compared with ferrite and martensitic alloys, austenitic alloys have higher hydrogen solubility and lower hydrogen diffusion coefficient, so they have better resistance to hydrogen embrittlement and are a type of alloy that can be used in hydrogen-facing environments . However, it should be pointed out that the austenitic alloys currently used in hydrogen-facing environments in China are all single-phase austenitic alloys (such as: 316L, 304N, etc.). Low (yield strength of 200 ~ 450MPa level), resulting in the scope of use of this type of alloy is limited. Contents of the invention [0003] In view of the urgent use of high-strength structural materials in the hydrogen environment, the purpose of the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C33/04C21D8/06
Inventor 赵明久戎利建陈胜虎
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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