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A Method to Improve the Machinability of 304 Stainless Steel

A 304 stainless steel, easy-to-process technology, applied in the field of stainless steel processing, can solve the problems of inconvenient processing, difficult processing, affecting cutting performance, etc., and achieve the effects of reducing viscosity, reducing heat, and reducing hardening strength

Active Publication Date: 2019-12-20
WUHE HUANGHUAI GRAIN & OIL MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 304 stainless steel is widely used in medical, nuclear power, aviation, ship and other technical fields because of its good comprehensive performance in high temperature corrosion environment, but at the same time, its physical and mechanical properties also greatly affect its cutting performance. Processing brings a lot of inconvenience, it is a typical difficult-to-process material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for improving the machinability of 304 stainless steel, comprising the following steps:

[0016] (1) Adjust the composition of 304 stainless steel according to the mass percentage: Ni accounts for 8.5%, Cr accounts for 18.8%, Cu accounts for 0.35%, Mn accounts for 1.30%, Fe accounts for 69.0%, and the rest is non-metallic elements;

[0017] (2) After melting and refining, slag removal, pouring and annealing treatment, the prepared refining agent is added during smelting, and the content of alloy elements is measured after each slag removal until it meets the requirements. Minutes, the temperature is lowered at a rate of 15°C per second for the first 1 minute, at a rate of 40°C per second for the next 2 minutes, and then at a rate of 60°C per second until it cools to 130°C;

[0018] (3) Pickling operation is carried out after thermal annealing. The pickling solution used contains the following components in parts by weight: 40 parts of oleic acid, 30 parts of so...

Embodiment 2

[0022] A method for improving the machinability of 304 stainless steel, comprising the following steps:

[0023] (1) Adjust the composition of 304 stainless steel according to the mass percentage: Ni accounts for 8.55%, Cr accounts for 18.85%, Cu accounts for 0.38%, Mn accounts for 1.32%, Fe accounts for 69.2%, and the rest is non-metallic elements;

[0024] (2) After smelting, slag removal, pouring and annealing treatment, the prepared refining agent is added during smelting, and the content of alloy elements is measured after each slag removal until it meets the requirements. The annealing process is as follows: Minutes, the temperature is lowered at a rate of 18°C ​​per second for the first 1.5 minutes, then at a rate of 45°C per second for the next 3 minutes, and then at a rate of 70°C per second until it reaches 140°C;

[0025] (3) Pickling operation is carried out after thermal annealing. The pickling solution used contains the following components in parts by weight: 45...

Embodiment 3

[0029] A method for improving the machinability of 304 stainless steel, comprising the following steps:

[0030] (1) Adjust the composition of 304 stainless steel according to the mass percentage: Ni accounts for 8.6%, Cr accounts for 18.9%, Cu accounts for 0.40%, Mn accounts for 1.35%, Fe accounts for 69.5%, and the rest is non-metallic elements;

[0031] (2) After smelting, slag removal, pouring and annealing treatment, the prepared refining agent is added during smelting, and the content of alloy elements is measured after each slag removal until it meets the requirements. Minutes, the first 2 minutes to cool down at a rate of 20°C per second, the next 5 minutes at a rate of 50°C per second, and then at a rate of 80°C per second until cooling to 150°C;

[0032] (3) Pickling operation is carried out after thermal annealing. The pickling solution used contains the following components in parts by weight: 50 parts of oleic acid, 40 parts of sodium hypochlorite, 30 parts of sor...

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PUM

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Abstract

The invention relates to the technical field of stainless steel processing and discloses a method for improving the easy processability of 304 stainless steel. According to the method, contents of various elemental compositions of stainless steel are regulated, the contents of copper and manganese are lowered, and the contents of nickel and chromium and the contents of non-metallic elements are increased, so that the hardening strength is lowered, and the stainless steel has lower thermal conductivity; by adding a prepared refining agent in the smelting process, the refining speed can be accelerated, and the residue rate is lowered; as an annealing procedure is slowly performed, the viscidity of a stainless steel material can be lowered, the accuracy and the surface quality of the stainless steel material under cutting processing are liable to control, heat in a cutting region is lowered, and thermal deformation caused by uneven expansion of a whole part cannot be caused.

Description

technical field [0001] The invention belongs to the technical field of stainless steel processing, and in particular relates to a method for improving the easy processing performance of 304 stainless steel. Background technique [0002] 304 is a versatile stainless steel, which is widely used in the production of equipment and parts that require good overall performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel. 304 stainless steel is a grade of stainless steel produced according to the American ASTM standard. Suitable for food processing, storage and transportation, common ones include: plate heat exchangers, bellows, household items (category 1 and 2 tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (windshield wipers, mufflers, moldings), medical appliances, etc., 304 stainless steel is food-gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42C22C38/04C22C38/02C22C33/04C21C7/04C21D1/26C23G1/08
CPCC21C7/04C21D1/26C22C33/04C22C38/02C22C38/04C22C38/42C23G1/088Y02P10/20
Inventor 武献东
Owner WUHE HUANGHUAI GRAIN & OIL MACHINERY CO LTD
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