Seamless steel pipe material for boron-containing hydraulic prop
A technology of hydraulic struts and seamless steel pipes, applied in the field of material metallurgy, can solve the problems of unreachable yield strength, poor comprehensive mechanical properties of materials, poor hardenability of 27SiMn, etc., and achieve the effect of improving hardenability and high yield strength
Active Publication Date: 2020-05-22
BAOTOU IRON & STEEL GRP
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[0002] The seamless steel pipe material for hydraulic props is mostly used in special equipment such as coal mining hydraulic supports, truck crane hydraulic cylinders, pistons, and large machinery. Among them, 27SiMn is the most widely used steel grade in the coal machinery industry. Ordinary 27SiMn has poor hardenability , especially in the production of thick-walled pipes with a wall thickness ≥ 25 mm, the comprehensive mechanical properties of the material are poor due to impervious quenching. At the tempering temperature specified by the user, the yield strength of the material cannot meet the requirements of the coal machinery industry ≥ 760 MPa, making Thick-wall hydraulic prop pipes have to be produced with high-cost 30CrMnSiA, resulting in high production costs
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[0020] The steelmaking production process is: hot metal pretreatment→converter smelting→LF refining→VD degassing→round billet continuous casting. All use pre-desulfurized hot metal, incoming hot metal composition requirements: P≤0.140%, S≤0.050%; converter smelting, double slag process smelting, final slag basicity controlled at 3.0, using ferromanganese for deoxidation alloying, final deoxidation using There is an aluminum deoxidation process; LF performs desulfurization and fine-tunes the composition, adopts the method of gradually increasing the heating rate from low-level to high-level, and performs slagging desulfurization, composition adjustment and temperature-raising operation according to the composition and temperature of the converter molten steel; VD vacuum degree ≤ 0.10 Kpa, target value ≤ 0.06Kpa, deep vacuum time ≥ 15 minutes, then feed 150m silicon-calcium wire, feed titanium-iron after feeding silicon-calcium wire, then feed boron iron, and then soft blowing ti...
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The invention discloses a seamless steel pipe material for a boron-containing hydraulic prop. The seamless steel pipe material for the boron-containing hydraulic prop comprises the following chemicalcomponents in percentage by mass: 0.20%-0.32% of C, 0.15%-0.35% of Si, 1.10%-1.40% of Mn, not greater than 0.020% of P, not greater than 0.010% of S, 0.10%-0.55% of Cr, 0.010%-0.035% of Al, 0.001%-0.003% of B, 0.02%-0.035% of Ti, and the balance Fe and inevitable impurities. The invention further discloses a preparation method thereof. According to the seamless steel pipe material for the boron-containing hydraulic prop, a seamless steel pipe for the hydraulic prop, which is manufactured through the method, is high in hardenability, and particularly capable of meeting the mechanical property of a seamless steel pipe for a thick-wall hydraulic prop with a wall thickness of not less than 25mm.
Description
technical field [0001] The invention relates to the technical field of material metallurgy, in particular to a boron-containing seamless steel pipe material for hydraulic props. Background technique [0002] The seamless steel pipe material for hydraulic props is mostly used in special equipment such as coal mining hydraulic supports, truck crane hydraulic cylinders, pistons, and large machinery. Among them, 27SiMn is the most widely used steel grade in the coal machinery industry. Ordinary 27SiMn has poor hardenability , especially in the production of thick-walled pipes with a wall thickness ≥ 25 mm, the comprehensive mechanical properties of the material are poor due to impervious quenching. At the tempering temperature specified by the user, the yield strength of the material cannot meet the requirements of the coal machinery industry ≥ 760 MPa, making Thick-walled hydraulic prop pipes have to be produced with high-cost 30CrMnSiA, resulting in high production costs. [...
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Patent Timeline
Login to View More IPC IPC(8): C22C38/32C22C38/28C22C38/06C22C38/04C22C38/02C22C33/04C21D8/10C21D1/18
CPCC21D1/18C21D8/105C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32
Inventor 张行刚张昭米永峰余泽金石晓霞康利明姜海龙陈镇方郭志文
Owner BAOTOU IRON & STEEL GRP