TH1901004981A - High strength hot rolled steel plate and its manufacturing method. - Google Patents

Abstract

DEPCT63 high-strength steel plate with a TS tensile strength greater than or equal to 980 MPa, which has excellent low-temperature press-formability and toughness, and That production method There are specified elements. The structure defines an upper bainite phase greater than or equal to 75.0% and less than 97.0% with an area ratio as the main phase. and the average grain size of The main phase is less than or equal to 12.0 μm, indicating a structure consisting of one or two types of lower bainite phase and/or tempered martensite phase. The martensite phase that exceeds 3.0% and is less than or equal to 25.0% with an area ratio of phase 2 and the number density of that phase 2 with a circular equivalent diameter greater than or equal to 0.5 micrometer is Less than or equal to 150,000 grains/square millimetre. and the arithmetic mean roughness (Ra) of the steel plate surface is less than or equal to 2.00 micrometers ------------------------------- ----------------------------

Claims (1)

: DEPCT63 high strength steel plate with TS tensile strength greater than or equal to 980 MPa, which has excellent press forming ability and low temperature toughness and Production method; Has a given element The structure defines the phase upper benite that is greater than or equal to 75.0% and less than 97.0% with a primary phase area ratio. And the average grain size of The primary phase is less than or equal to 12.0 μm. A structure consisting of one or two types of the lower benite phase and / or martensite phase is rehabilitated. Martensite phase that is more than 3.0% and less than or equal to 25.0% with area ratio as phase 2 and density, that number of phase 2 with circle equivalent diameter greater than or equal to 0.5 μm is Less than or equal to 150,000 grains / mm2 And the arithmetic mean roughness (Ra) of the steel plate surface is less than or equal to 2.00 μm ------------------------------- ---------------------------- Privilege (number one) which will appear on the advertisement page: DEPCT63 1. High strength hot rolled steel sheet whose tensile strength TS is greater than or equal to 980 MPa by The composition consists of C: greater than or equal to 0.04% and less than or equal to 0.15%, Si: greater than or equal to 0.4% and less than or equal to 2.0%, Mn: greater than or equal to 1.0% and less than or equal to 3.0%, P: less. Greater than or equal to 0.100% (inclusive of 0%), S: less than or equal to 0.0100% (inclusive of 0%), AI: greater than or equal to 0.01% and less than or equal to 2.00%, N: less than or equal to 0. Tags: