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Steel plate heat treatment protective agent and heat treatment method

A heat treatment method and heat treatment protection technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as the inability to realize the controllable operation of ultra-high hardness wear-resistant plates, and the inability to solve the problem of uniform cooling of steel plates, etc. The effect of small shape deformation and wide range of sources

Active Publication Date: 2014-09-24
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quenching process cannot solve the problem of uniform cooling of the steel plate, resulting in the transformation of austenite to martensite, and the uneven volume expansion produces a large structural stress that affects the shape of the plate. The current equipment status and technology cannot realize the quenching of ultra-high hardness wear-resistant plates Controllable operation of plate shape

Method used

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  • Steel plate heat treatment protective agent and heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1. Rolling: Before rolling, cut a gap of 25 mm in the middle of the two opposite long sides of the billet, hot-roll or cold-roll the billet at 950 ° C, and roll each billet into two steel plates way of rolling.

[0068] 2. Shot blasting: Select a rolled NM360 steel plate of 30*1800*5600mm, and use a shot blasting machine to blast it.

[0069] 3. Preparation and coating of heat treatment protective agent: Stir and mix the precipitated barium sulfate powder and water according to the ratio of 1:1, and then use the manual coating method to evenly smear on the upper and lower surfaces of the steel plate. The thickness of the coating film is about 2mm.

[0070] 4. Heat treatment:

[0071] (1) The temperature setting of the open flame normalization furnace: the length of the open flame normalization furnace is 50m, except for the first and last 1m, it is divided into six sections of heat treatment, each section is 8m in length, and the furnace temperature settings of each s...

Embodiment 2

[0079] 1. Rolling: Before rolling, cut a gap of 20mm in the middle of the two opposite long sides of the steel billet, hot-roll or cold-roll the steel billet at 950°C, and roll each billet into two steel plates way of rolling.

[0080] 2. Shot blasting: Select a rolled NM360 steel plate of 30*1800*5600mm, and use a shot blasting machine to blast it.

[0081] 3. Preparation and coating of heat treatment protective agent: Stir and mix the precipitated barium sulfate powder and water according to the ratio of 0.95:1.05, and then use the manual coating method to evenly smear on the upper and lower surfaces of the steel plate. The thickness of the coating film is about 3mm.

[0082] 4. Heat treatment:

[0083] (1) The temperature setting of the open flame normalization furnace: the length of the open flame normalization furnace is 50m, except for the first and last 1m, it is divided into six sections of heat treatment, each section is 8m in length, and the furnace temperature set...

Embodiment 3

[0091] 1. Rolling: Before rolling, cut a gap of 15mm in the middle of the two opposite long sides of the steel billet, hot-roll or cold-roll the steel billet at 950°C, and roll each billet into two steel plates way of rolling.

[0092] 2. Shot blasting: Select a rolled NM360 steel plate of 30*1800*5600mm, and use a shot blasting machine to blast it.

[0093] 3. Preparation and coating of heat treatment protective agent: Stir and mix the precipitated barium sulfate powder and water according to the ratio of 1.1:0.9, and then apply it evenly on the upper and lower surfaces of the steel plate by hand. The thickness of the coating film is about 2.5mm.

[0094] 4. Heat treatment:

[0095] (1) The temperature setting of the open flame normalization furnace: the length of the open flame normalization furnace is 50m, except for the first and last 1m, it is divided into six sections of heat treatment, each section is 8m in length, and the furnace temperature settings of each section ...

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Abstract

The invention discloses steel plate heat treatment protective agent slurry. The slurry comprises barium sulfate and water with the mass ratio of (0.9-1.1):(0.9-1.1), preferably the mass ratio of thebarium sulfate to water is 1:1. A heat treatment method for a steel plate comprises the following steps of: (1) prepariation and coating of the steel plate heat treatment protective agent: mixing the barium sulfate and the water according to the mass ratio of (0.9-1.1):(0.9-1.1) to prepare the steel plate heat treatment protective agent, preferably the mass ratio of thebarium sulfate to water is 1:1, and coating the heat treatment protective agent on the surface of the steel plate; (2) heat treatment: transferring the steel plate coated with the steel plate heat treatment protective agent in the step (1) into an open fire normalizing furnace under a weak oxidization atmosphere for heating; and (3) quenching treatment: transferring the steel plate in the step (2) into an unrestraint quenching machine for quenching, and adjusting the ratio of upper water volume and lower water volume to be 0.42-0.48 in the quenching process, and preferably the ratio is 0.45.

Description

technical field [0001] The invention relates to a steel plate heat treatment protective agent and a heat treatment method. In particular, it relates to a heat treatment protective agent containing barium sulfate and a heat treatment method. Background technique [0002] The NM360 series of wear-resistant plates are currently concentrated in scraper conveyors in the coal machinery industry, loaders in the engineering industry, large transport vehicle compartments, and large lifting equipment. It is required to be below 4mm / m. At present, the production of wear-resistant steel uses radiant tube furnaces and roll-type quenching machines. This method has relatively high requirements for equipment, high equipment manufacturing costs, and the heating temperature of radiant tube furnaces is low, up to 1000 ° C, which cannot meet the requirements of stainless steel, etc. The solid solution temperature process requirements of the product and the production of heat treatment varieti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/70C21D9/52
Inventor 罗团张宝莲李俊生崔永渤罗精明苏涛
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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