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42 CrMo steel cold-rolled sheet and its production method

A production method and technology for cold-rolled sheets, which are applied in the field of steel manufacturing, can solve problems such as cracking and affect formability, and achieve the effects of good toughness, excellent cutting performance, and prevention of cold-rolled cracking.

Active Publication Date: 2014-06-25
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the problem that 42CrMo steel is easy to form hard and brittle martensite structure during cooling, so that it will crack during cold rolling and affect its formability. This method is suitable for large-scale production operations, and its products have high strength, toughness and Good stamping performance

Method used

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  • 42 CrMo steel cold-rolled sheet and its production method
  • 42 CrMo steel cold-rolled sheet and its production method
  • 42 CrMo steel cold-rolled sheet and its production method

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Embodiment Construction

[0025] The present invention will be further described below by way of examples.

[0026] The composition of the present invention is C: 0.38~0.45, Si: 0.17~0.37, Mn: 0.50~0.90, P: <0.035, S: <0.035, Cr: 1.02~1.14, Mo: 0.15~0.25, and the rest is Fe and not The impurity that avoids, table 1 adopts several optimal embodiments of its composition for the present invention, and carries out hot rolling, cold rolling production under the condition shown in table 2, table 3 by the inventive method, and according to table 3 The conditions shown are spheroidizing annealing by bell annealing method, followed by air cooling after keeping warm at 400°C with a cover. The 42CrMo cold-rolled and annealed sheets with thicknesses of 1.8, 2.0, 2.45, and 2.95 mm are produced by the above-mentioned process, and their mechanical properties are shown in Table 4. The typical metallographic structure of the examples is shown in the accompanying drawings, and the spheroidization grade is the highest. ...

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Abstract

The invention discloses a 42CrMo steel cold-rolled plate and its production method, and the 42CrMo steel cold-rolled plate comprises the following chemical components by mass: 0.38-0.45% of C, 0.17-0.37% of Si, 0.50-0.90% of Mn, less than 0.035% of P, less than 0.035% of S, 1.02-1.14% of Cr, 0.15-0.25% of Mo, and balance of Fe. The production method comprises molten steel smelting, continuous casting, hot rolling, cold rolling, bell-type furnace annealing, finishing and other processes, and is characterized in that, the hot rolled steel billet heating temperature is 1170-1270 DEG C, the finish rolling temperature is 850-950 DEG C, the coiling temperature is 700-750 DEG C, the cold rolling ratio down press rate is 25%-55%, the annealing temperature is Ac1-(10-30) DEG C, the heat insulation time is 8-14h, air cooling is performed when the billet is heat insulated to 400 DEG with a bell, and the flat elongation is 0.5%-1.2%. The 42CrMo steel cold-rolled plate is good in plasticity, toughness and cutting performances, and helps a user to perform cutting, stamping process and subsequent heat treatment.

Description

technical field [0001] The invention belongs to the technical field of steel production, and in particular relates to a cold-rolled 42CrMo alloy structural steel plate and a production method thereof. Background technique [0002] Cold-rolled steel plate has the advantages of good surface quality and high dimensional accuracy. With the development of economy, it has been called a necessary material in modern society. The comprehensive mechanical properties of the cold-rolled sheet can be improved by annealing, so that it has high stamping performance, low yield point and no aging effect, and can be widely used in the fields of automobile and home appliance manufacturing. 42CrMo steel belongs to the chromium-molybdenum steel group in alloy structural steel, with high carbon and chromium content, so it has good hardenability, high strength, high low-temperature impact value, good high-temperature strength, and good creep resistance. It can be used to manufacture gears, rear a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C33/04C21D8/02
Inventor 张宇刘仁东徐承明吕东王科强王旭王永明
Owner ANGANG STEEL CO LTD
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