Martensite non-tempered high-strength steel with tensile strength larger than or equal to 960 MP and manufacturing method thereof
A technology of tensile strength and manufacturing method, applied in the field of martensitic non-quenched and tempered high-strength steel with tensile strength ≥ 960MP and its manufacturing field, can solve problems such as failure to achieve stable batch production, and achieve excellent mechanical properties and high-quality finished products Effects on quality, yield, and vehicle weight reduction
- Application Information
AI Technical Summary
Problems solved by technology
 According to the method provided by the present invention, a non-quenched and tempered martensitic high-strength steel with a tensile strength of ≥960MP is manufactured. The chemical composition and mass percentage of the test steel are shown in the following table (the rest are iron and inevitable impurities):
 1. Steelmaking
 1. Hot metal pretreatment
 Pretreatment into the furnace S≤0.0030wt.%, P≤0.01wt.%, remove the slag; use refined scrap steel.
 2. Converter
 The converter pulls the carbon with one hit and avoids point blowing; the ladle is purged with argon before tapping to control the tapping port and avoid scattered flow.
 3. Refining
 The LF+RH dual path process is adopted, and the gas content is strictly controlled. The LF treatment process is required to maintain a slight positive pressure, strictly control the increase of LF, and the required increase of N is ≤10ppm; LF uses active...
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