Method for preventing surface cracking in austenitic stainless steel forge piece manufacturing process

A technology of austenitic stainless steel and manufacturing process, which is applied in the field of steel processing and forging, which can solve the problems of high manufacturing cost, scratch cleaning, and long forging manufacturing cycle, and achieve the effect of low difficulty, less shrinkage cavity and looseness, and fast solidification speed

Pending Publication Date: 2022-05-17
SHANDONG IRAETA HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different degrees of cracks generally appear on the surface of forgings using steel ingots, which basically requires cleaning every time the forging is fired. The manufacturing cycle of forgings is longer and the manufacturing cost is higher.

Method used

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  • Method for preventing surface cracking in austenitic stainless steel forge piece manufacturing process
  • Method for preventing surface cracking in austenitic stainless steel forge piece manufacturing process
  • Method for preventing surface cracking in austenitic stainless steel forge piece manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The applicant took the 304 material φ6879xφ6379x222mm top support forging ring ordered by a customer as an example. The weight of the forging ring blank: 14.8 tons, and the blanking weight was 16.7 tons.

[0032] Implementation of the present invention comprises the following steps:

[0033] (1) Slab sawing: After the slabs pass the re-inspection after entering the factory, they are sawed and cut into 9 small unit slabs with a size (length×width×height) of 1230x1120x200mm;

[0034] (2) Heat treatment of slab: solution treatment, heating temperature is 1060℃±10℃;

[0035] (3) Milling: small unit slab milling 6 faces, the size is (length × width × height) 1220x1110x193mm, the roughness of the upper and lower sides is Ra6.3, and the rest of the surface is Ra12.5;

[0036] (4) Cleaning and grinding, the cleanliness of the upper and lower surfaces of each blank RFU=5;

[0037] (5) Blank assembly: the slab is assembled on the platform in advance, and the time for the whole ...

Embodiment 2

[0052] The applicant undertakes a nuclear power project ring of φ4825xφ3930x185mm in F316H material ordered by a customer as an example. The weight of the forging ring blank is 22 tons, and the blanking weight is 26.5 tons.

[0053] Implementation of the present invention comprises the following steps:

[0054] (1) Slab sawing: the size of the slab is 9210mm×1545mm×200mm, and after passing the re-inspection at the factory, it is sawed and cut into 10 small unit slabs with a size (length×width×height) of 1545×1150×200mm.

[0055] (2) Slab heat treatment: solution treatment first, the heating temperature is 1060°C ± 10°C.

[0056] (3) Milling: small unit slab milling 6 faces, the size is (length x width x height) 1530x1130x193mm, the roughness of the upper and lower sides is Ra6.3, and the rest of the face is Ra12.5.

[0057] (4) Cleaning and grinding, the cleanliness of the upper and lower surfaces of each billet is RFU=6.

[0058] (5) Blank assembly: the slab is assembled on...

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Abstract

The invention relates to a process for preventing surface cracking in the manufacturing process of austenitic stainless steel forgings, and belongs to the field of steel machining and forging. The method comprises the following steps: sawing a plate blank; plate blank heat treatment; milling the plate blank; polishing and cleaning the plate blank; assembling the plate blanks, and performing vacuum seal welding; heating the seal welding steel billet; constructing a seal welding steel billet; carrying out blank peeling treatment; forging cogging and forging forming; carrying out solution treatment on forgings; semi-finishing is conducted; performing ultrasonic detection; sampling, and carrying out physical and chemical detection; according to the method, the surface of the austenitic stainless steel forge piece is free of cracking in the manufacturing process. And a smaller unit continuous casting sheet billet is adopted as an element, so that the produced continuous casting sheet billet has the characteristics of homogenization, densification and purification, and the quality of the austenitic stainless steel forge piece is improved.

Description

technical field [0001] The invention relates to a technology for preventing surface cracking in the manufacturing process of austenitic stainless steel forgings, belonging to the field of steel processing and forging. Background technique [0002] Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature. When the steel contains about 18% Cr, Ni8%-10%, and C about 0.1%, it has a stable austenite structure. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low. It is impossible to strengthen it through phase transformation. It can only be strengthened by cold working. If S, Ca, Se, Te and other elements are added, it has good properties. Machinability. [0003] Austenitic stainless steel forgings are widely used in nuclear power, chemical containers, petroleum refining and other fields. Austenitic stainless steel has the characteristics of small thermal conductivity, large linear ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 银伟任秀凤赵方娜李敏赵兴明刘兰潇李玲曹祥万传铭曹伟飞陈淑亮韩梅梅刘丹丹张立
Owner SHANDONG IRAETA HEAVY IND
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