Low-cost steel for automobile beam and manufacturing method thereof

A technology of automobile girders and manufacturing methods, which is applied in the direction of manufacturing tools, manufacturing converters, metal rolling, etc., can solve the problems of long smelting cycle of LF furnace, reduce alloy cost, high power consumption of refining, etc., and achieve stable performance , Alloy cost reduction, smelting cost reduction effect

Inactive Publication Date: 2011-10-12
SHOUGANG CORPORATION
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  • Abstract
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Problems solved by technology

[0011] The purpose of the present invention is to provide a low-cost automobile beam steel and its manufacturing method, which...

Method used

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  • Low-cost steel for automobile beam and manufacturing method thereof
  • Low-cost steel for automobile beam and manufacturing method thereof
  • Low-cost steel for automobile beam and manufacturing method thereof

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Embodiment Construction

[0044] Process route: KR molten iron stirring desulfurization→converter steelmaking→RH refining→calcium feeding line→slab pouring→slab finishing→storage, inspection→heating furnace heating→controlled rolling→controlled cooling→coiling→inspection and storage .

[0045] The total period of the RH refining process is between 35 and 50 minutes, and the average total period is 15 minutes shorter than that of the LF refining process, which improves the production efficiency.

[0046] The actual smelting chemical composition is shown in Table 1, the specific rolling process parameters are shown in Table 2, and the mechanical property test results are shown in Table 3.

[0047] Table 1. Chemical composition of low-cost niobium-containing hot-rolled steel coils for automobile frames, wt%

[0048] example

[0049] Table 2. Process parameters of low-cost niobium-containing steel for automobile frame hot-rolled coils

[0050]

[0051] Table 3. Performance test results of lo...

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Abstract

The invention relates to low-cost steel for an automobile beam and a manufacturing method thereof. The steel comprises the following chemical components in percentage by weight: 0.06-0.12% of carbon, 0.08-0.20% of silicon, 1.00-1.40% of manganese, 0.015-0.03% of niobium, less than or equal to 0.015% of phosphorus, less than or equal to 0.008% of sulphur, 0.02-0.06% of aluminium, less than or equal to 0.003% of [O], less than or equal to 0.005% of [N], and the balance of iron and unavoidable micro impurities. In the invention, by optimizing a process route, the problems of long smelting cycle of an LF (Ladle Furnace) and high power consumption for refining can be solved; the alloy production cost is reduced; by means of the process, the electricity consumption per ton of steel is reduced; the total refining cycle is shortened; and the beam steel production with low alloy cost is realized by using an optimized controlled rolling and controlled cooling process system.

Description

[0001] Field [0002] The invention relates to a low-cost automobile frame steel and a manufacturing method thereof, in particular to the production of a hot-rolled strip steel for an automobile frame with low smelting cost and low alloy cost. Background technique [0003] Automobile girder plates are mainly used for the manufacture of transverse beams, longitudinal beams and other structural parts of trucks. The car girder plates are all formed by cold stamping, and the car is subjected to various impacts, torsion and other complex stresses during driving, requiring high strength, good plasticity, toughness, cold bending performance, and fatigue resistance. It is required that the plate shape is good and the dimensional control precision is high. [0004] Publication No. CN 10194728A Niobium-titanium composite light truck automobile frame steel and its preparation method, its main chemical components are: C: 0.09-0.15wt%, Si: 0.30-0.60wt%, Mn: 1.25-1.50%, Ti : 0.010~0.030wt...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21C1/02C21C5/28C21C7/10C21D8/00B21B37/00
Inventor 孟宪堂赵林李瑞恒季晨曦于洋武军宽包春林
Owner SHOUGANG CORPORATION
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