Forging and heat treatment process of marine anticorrosion pull rod duplex stainless steel forge piece

A duplex stainless steel, forging heating technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of metallographic structure prone to intergranular precipitate grains, complex manufacturing process, and high product scrap rate, and improve the All aspects of performance, grains are more uniform and refined, and the effect of eliminating the as-cast structure

Active Publication Date: 2021-06-04
无锡继平新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing forging and heat treatment technologies have problems such as large processing deformation, easy occurrence of intergranular precipitates and coarse or uneven grains in the metallographic structure
Uniformly refining the grains of HDR stainless steel forgings and reducing the generation of harmful phases can effectively solve such problems. At present, the traditional grain refining process of forgings is complicated, and the material has poor metal fluidity at high temperature.
The product is prone to mixed crystals, surface cracks, and the product scrap rate is high

Method used

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  • Forging and heat treatment process of marine anticorrosion pull rod duplex stainless steel forge piece
  • Forging and heat treatment process of marine anticorrosion pull rod duplex stainless steel forge piece
  • Forging and heat treatment process of marine anticorrosion pull rod duplex stainless steel forge piece

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: a kind of forging and heat treatment process of the duplex stainless steel forging of anti-corrosion tie rod for marine, such as figure 1 shown, including the following steps:

[0033] S1. Smelting the raw materials to obtain steel ingots: the raw materials are sent to the electric arc furnace for smelting, then the raw materials are refined out of the furnace, and finally the raw materials are electroslag remelted to obtain steel ingots.

[0034] S2. Steel ingot forging and heating, including the following steps:

[0035] (1) Furnace loading; the temperature of steel ingot loading furnace is ≤400℃.

[0036] (2) Heating: According to the maximum heating power, the temperature is raised to 400-800°C, and then the temperature is evenly raised to the holding temperature.

[0037] (3) Heat preservation: heat preservation is carried out in stages. The heat preservation temperature of the first stage is 860°C; the heat preservation temperature of the second st...

Embodiment 2

[0050] Embodiment 2: A forging and heat treatment process of a marine anti-corrosion tie rod duplex stainless steel forging. Its different steps from Embodiment 1 are:

[0051] S3. Steel ingots are forged to obtain forgings. Forging includes three steps:

[0052] 1. The first firing: the steel ingot is heated up to the forging temperature, and the forging temperature is 1150°C, and then the steel ingot is drawn, upset, and drawn out in sequence to ensure that the final forging temperature is ≥ 650°C, and the total drawing length ratio is > 2.2; total upsetting Rough ratio > 2.2. Then put the steel ingot into the forging heating furnace for heating, the heating temperature is 1140°C, the heating time is positively related to the thickness of the steel ingot, and the steel ingot with a thickness of 200mm is heated for 1-1.2h.

[0053] 2. The second firing: the steel ingot is heated up to the forging temperature, and the forging temperature is 1130°C. After the forging is heated...

Embodiment 3

[0057] Embodiment 3: A forging and heat treatment process of a marine anti-corrosion tie rod duplex stainless steel forging. Its different steps from Embodiment 1 are:

[0058] S3. Steel ingots are forged to obtain forgings. Forging includes three steps:

[0059] 1. The first firing: the steel ingot is heated up to the forging temperature, and the forging temperature is 1160°C, and then the steel ingot is drawn, upset, and drawn out in sequence to ensure that the final forging temperature is ≥ 650°C, and the total drawing length ratio is > 2.2; total upsetting Rough ratio > 2.2. Then put the steel ingot into the forging heating furnace for heating, the heating temperature is 1150°C, the heating time is positively related to the thickness of the steel ingot, and the steel ingot with a thickness of 200mm is heated for 1-1.2h.

[0060] 2. The second firing: the steel ingot is heated up to the forging temperature, and the forging temperature is 1140°C. After the forging is heated...

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Abstract

The invention discloses a forging and heat treatment process of a marine anticorrosion pull rod duplex stainless steel forge piece, and belongs to the technical field of stainless steel forging treatment. The forging and heat treatment process is characterized by comprising the following steps that S1, smelting raw materials to obtain a steel ingot; S2, forging and heating the steel ingot; S3, forging the steel ingot to obtain a forge piece, specifically, the forging comprises three heating numbers, 1, in the first heating number, the forging temperature of the steel ingot is 1140-1160 DEG C; in the second heating number, the forging temperature of the steel ingot is 1120-1140 DEG C; in the third heating number, the forging temperature of the steel ingot is 1070-1100 DEG C; S4, the forge piece heat treatment, specifically, the forge piece heat treatment comprises the following steps of 1, water cooling treatment of the forge piece after forging; 2, forging rough machining; 3, the forge piece solution treatment; and S5, the forge piece finish machining. The method has the advantages that the uniform refining degree of crystal grains is improved, and the service life of the forge piece is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of stainless steel forging treatment, in particular to a forging and heat treatment process for a duplex stainless steel forging of a marine anti-corrosion tie rod. Background technique [0002] HDR is an ultra-low carbon duplex stainless steel, which is composed of 50% austenite and 50% ferrite duplex. It is the most advanced Cr25 high-alloy super duplex stainless steel in the austenite-ferritic duplex stainless steel. It is most suitable for seawater corrosion resistance, seawater erosion corrosion and use in medium rich in chloride ions and some acidic medium. At present, HDR steel series can be made into pipes, strips, rods, wires and other profiles and their products (such as various pipe fittings for seawater filters, shaped elbows, valves, etc.), and have been widely used in ships, chemical plants and nuclear power plants. . [0003] Existing forging and heat treatment technologies have problems suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04C21D1/60C21D9/00B21K29/00C22C38/58C22C38/02C22C38/12B21J5/00
CPCB21C37/04C21D1/60C21D9/0075B21K29/00C22C38/58C22C38/02C22C38/12C22C38/001B21J5/002Y02P10/20
Inventor 朱怡张志宏陈振龙朱玉成
Owner 无锡继平新材料科技有限公司
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