8results about How to "Improved cold working properties" patented technology

The invention discloses steel for a thin-gauge automobile beam with the tensile strength larger than 510 MPa and a production method of the steel. The steel for the automobile beam comprises, by mass, 0.06%-0.08% of C, 0.03%-0.10% of Si, 0.80%-1.00% of Mn, smaller than or equal to 0.018% of P, smaller than or equal to 0.005% of S, 0.020%-0.045% of Alt, 0.012%-0.022% of Nb, 0.025%-0.037% of Ti, 0.0008%-0.0020% of Ca and the balance Fe and inevitable impurities. The steel for the thin automobile frame has the advantages of high strength, high toughness, high forming precision and the like, meets good matching of strength and forming performance in the performance aspect, is free of cracks in a cold bending test and has good cold machining performance.

The invention aims to provide the high-strength and high-toughness seamless tube for the automobile safety bag and the preparation method of the high-strength and high-toughness seamless tube, and the purpose that the steel tube has high strength, high plasticity and toughness and excellent low-temperature blasting resistance is achieved. The steel for the seamless tube for the automobile safety bag comprises the following chemical components in percentage by weight: 0.02-0.04% of C; 0.2 to 0.4 percent of Si; mn: 1.5 to 1.7%; s < = 0.005%; p is less than or equal to 0.01%; 0.04% to 0.06% of Nb; 0.02 to 0.04 percent of V; 0.01 to 0.02 percent of Ti; 0.7%-1.0% of Cu; n < = 0.002%; o < = 0.002%; al is less than or equal to 0.03%; and the balance of Fe and inevitable impurities. The steel pipe is made of microalloyed steel and has the advantages of being high in strength, good in plasticity and toughness, excellent in blasting resistance, good in cold machining performance and low in cost. The optimization of the steel pipe for the automobile safety bag from material selection to a specific cold drawing process is achieved, and the yield strength of the steel pipe is larger than 860 MPa, the tensile strength is larger than 1000 MPa, and the ductility is larger than 25%; and according to the GB / T241-2007 standard, the steel pipe is placed at the temperature of minus 40 DEG C for 24 hours and then subjected to a blasting experiment, and the pressure of the blasting steel pipe is larger than or equal to 130 MPa.

The application belongs to the technical field of stainless steel preparation, and discloses a cold-deformable and heat-treatable hardening Ni-free high-strength stainless steel and a preparation method thereof. The stainless steel comprises the following components in percentage by mass: Cr: 13-15%, C: 0.25-0.4%, Mn: 0.5-2%, Cu: 0.1-3%, Mo: 2-3%, Si: 0-0.5%, and the balance of Fe and inevitable impurities. The stainless steel does not contain Ni element, has a low work hardening rate (strain hardening index n≤0.185) and a fracture elongation rate of more than 20% in a soft state (annealed state), is cold-deformable, and has low raw material and processing costs; after quenching and aging heat treatment, the stainless steel not only has an optimal combination of strength and toughness (yield strength and tensile strength are more than 1300 MPa and 1600 MPa respectively, and elongation is greater than 10%), but also has a high yield strength ratio.

The present application relates to a kind of high-precision cold-rolled screw with medium carbon steel hot rolled wire rod in metallurgical technology field, preparation method and application.The present application is aimed at solving the technical problems of low first processing qualified rate of cold-rolled screw caused by poor material organization uniformity and low purity.The chemical composition of the wire rod according to the present application is as follows: C 0.52-0.58%, Si 0.15-0.35%, Mn 0.70-0.90%, Cr 0.10-0.35%, Al 0.015-0.045%, Ti≤0.0025%, [O]≤0.0015%, [N]≤0.0060% and the like, with the balance being Fe.The preparation method of the present application obtains uniform organization with cross-section hardness range ≤20HV through the combined action of narrow component design, continuous casting end electromagnetic stirring, high temperature diffusion annealing and "fast first and slow later" controlled cooling process.The present application is mainly used for manufacturing high-precision ball screw, and the finished product precision reaches more than 5 levels, with first cold-rolled forming qualified rate ≥85%.

Provided is a steel sheet having excellent cold workability. The steel sheet of the present disclosure contains, in mass %, C: 0.20 to 0.70 %, Si: 0.07 to 1.00 %, Mn: 0.20 to 3.00 %, P: 0.030 % or less, S: 0.0080 % or less, Cr: 0.010 to 1.500 %, acid-soluble Al: 0.005 to 0.070 %, and N: 0.0200 % or less, with the balance being Fe and impurities, and in the microstructure, the total area fraction of ferrite and cementite particles is 95 % or more, the average grain size of ferrite grains is 5.0 to 30.0 µm, and the GOS (Grain Orientation Spread) value of the ferrite grains is 2.0° or less.

This invention provides steel sheets with excellent cold workability. The steel sheets disclosed herein contain, by mass percent: C: 0.20~0.70%, Si: 0.07~1.00%, Mn: 0.20~3.00%, P: less than 0.030%, S: less than 0.0080%, Cr: 0.010~1.500%, acid-soluble Al: 0.005~0.070%, and N: less than 0.0200%, with an average ferrite grain size D. t The average grain size D of ferrite at a depth of t / 8 mm in the thickness direction of the steel plate, with a thickness of 5.00~30.00 μm, is given by the steel plate thickness t (mm). t / 8 The average grain size D of ferrite at depths of (μm) and t / 2mm is... t / 2 (μm) satisfies equation (1), and the sample standard deviation S of the ferrite grain size at a depth of t / 8mm is... t / 8 The sample standard deviation S of ferrite grain size at a depth of t / 2 mm below 4.50 μm. t / 2 Below 4.00 μm. 0.90 ≤ D t / 8 / D t / 2 ≤1.10 (1)

This disclosure provides a steel sheet with excellent hardenability and excellent cold workability. The steel sheet disclosed herein has the following composition by mass %: C: 0.15~0.50%, Si: 0.01~0.50%, Mn: 0.20~1.30%, P: less than 0.100%, S: less than 0.100%, Al: less than 0.100%, Cr: 0.01~1.20%, N: less than 0.0150%, and the balance being Fe and impurities. The total surface area of ​​ferrite and cementite particles is 95% or more, the average grain size of ferrite is 5.0~20.0 μm, and the Cr concentration in the cementite particles is [Cr]. θ and Mo concentration [Mo] θ To satisfy equation (1), the average particle size of the cementite particles is less than 1.50 μm, the spheroidization rate of the cementite particles is greater than 70% and less than 85%, and the dispersion DI of the number of cementite particles in a small square partition with a side length of 10 μm, as defined by equation (2), is less than 45%. 2[Cr] θ +3[Mo] θ ≤3 / √C (1) DI=σ θ / N θ ×100 (2)

This disclosure provides a steel sheet with excellent hardenability and excellent cold workability. The steel sheet disclosed herein has the following composition by mass %: C: 0.15~0.50%, Si: 0.01~0.50%, Mn: 0.20~1.30%, P: less than 0.100%, S: less than 0.100%, Al: less than 0.100%, Cr: 0.01~1.20%, N: less than 0.0150%, and the balance being Fe and impurities. The total surface area of ​​ferrite and cementite particles is 95% or more, the average grain size of ferrite is 5.0~20.0 μm, and the Cr concentration in the cementite particles is [Cr]. θ and Mo concentration [Mo] θ To satisfy equation (1), the average particle size of the cementite particles is less than 1.50 μm, the sphericity of the cementite particles is greater than 85%, and the dispersion DI of the number of cementite particles in a small square partition with a side length of 10 μm, as defined by equation (2), is less than 45%. 2[Cr] θ +3[Mo] θ ≤3 / √C (1) DI=σ θ / N θ ×100 (2)