A kind of steel for alloy structure and its manufacturing method
A technology for structural steel and a manufacturing method, applied in the field of steel grades and their manufacturing, can solve problems such as insufficient mechanical properties, and achieve the effects of high strength, high mechanical properties, and low material cost
Active Publication Date: 2022-06-24
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0004] With the development of technology, the mechanical properties of this steel cannot fully meet the current practical application and manufacturing requirements. Based on this, it is expected to obtain an alloy structural steel with higher mechanical properties, better impact toughness and more reasonable cost. to meet the needs of practical applications
Method used
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Embodiment 1-6 and comparative example 1-3
[0059] The alloy structural steel of embodiment 1-6 adopts the following steps to make:
[0060] (1) Using electric furnace smelting, LF refining and casting.
[0061] (2) Pre-rolling and billeting: the heating temperature is 1150-1250°C.
[0062] (3) Secondary hot rolling: the heating temperature is 1150-1250°C.
[0063] (4) Heat treatment: quenching + tempering, among which, the quenching heating temperature is 855-890°C, the cooling rate is controlled at 50-90°C / s, and the coolant is mineral oil; the tempering heating temperature is 645-670°C, and the cooling rate is It is 50-90℃ / min, and the coolant is mineral oil or water.
[0064] It should be noted that, in some other embodiments, RH refining can also be used for refining, and at the end of VD (or RH) refining, a small amount of zirconium-iron and magnesium-aluminum alloys can be added successively to prepare the chemical elements in the steel. After the mass percentage satisfies the range defined in this case, soft ...
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Abstract
The invention discloses a steel for alloy structure. The mass percentages of chemical elements are: C: 0.35-0.45%, Si: 0.27-0.35%, Mn: 0.6-0.8%, Al: 0.015-0.05%, V: 0.06-0.05%. 0.1%, Zr: 0.2‑1.0%, Mg: 0.001‑0.005%, P≤0.025%, S≤0.015%, N≤0.005%, O≤0.001%, and the balance is Fe and other unavoidable impurities. In addition, the present invention also discloses a method for manufacturing the above-mentioned steel for alloy structure, which includes the steps of: (1) smelting, refining and casting; (2) rough rolling; (3) secondary hot rolling; (4) Heat treatment: quenching + tempering. The steel for alloy structure is designed by adding trace alloy elements to further strengthen and toughen the steel for alloy structure, and the manufacturing cost is low.
Description
technical field [0001] The invention relates to a steel grade and a manufacturing method thereof, in particular to a structural steel and a manufacturing method thereof. Background technique [0002] 40CrV can be used to manufacture various important parts with variable load and high load, such as locomotive connecting rods, crankshafts, push rods, propellers, beams, bushing brackets, studs, screws, non-carburized gears, nitriding treatment Various gears and pins, high-pressure boiler water pump shaft (diameter less than 30mm), high-pressure cylinder, steel pipe and bolts (the working temperature is less than 420 ℃, the strength is 30MPa), etc. [0003] According to the alloy structural steel standard (GB / T 3077-2015), the existing composition range of 40CrV is as follows: C 0.37-0.44wt%; Si 0.17-0.37wt%; Mn 0.5-0.8wt%; S≤0.015wt%; P ≤0.025wt%; Cr 0.8-1.1wt%; V 0.1-0.2wt%; Al≥0.015wl. The mechanical properties of this steel are as follows: yield strength (Rel) ≥ 735MPa; te...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/00
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/002C21D8/005C22C38/005C21D2211/005C21D2211/009C21D2211/004C21D1/18C22C38/001C21D6/005C21D6/008C21D6/02C21D1/58C21D1/60C21D8/0226C21D8/0247C21D8/0205C21D9/46
Inventor 郑宏光柳向椿刘俊江翟瑞银万根节夏杨青孟庆玉
Owner BAOSHAN IRON & STEEL CO LTD