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High-toughness and high-weather-resistance steel and manufacturing method thereof

A manufacturing method and high weather resistance technology, which is applied in the field of high weather resistance steel and its manufacture, and high toughness, can solve the problems of low temperature toughness in the heat-affected zone, lower yield strength, and lower strength of controlled-rolled steel plates, etc.

Active Publication Date: 2014-04-02
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0006] However, these steel plates do not involve cold forming when the entire plate is cold-formed at 90 degrees in the length direction and width direction; secondly, the Cr element greatly reduces the strength of the ferrite + pearlite microstructure controlled-rolled steel plate and reduces the yield strength. The magnitude is greater than that of reducing the tensile strength (see "Xishan Memorial Technical Lectures" 86-87, P11), and there are great difficulties in producing high-processability, high-toughness and high-weathering steel plates by controlled rolling technology; at the same time, a large number of patent documents only illustrate How to realize the low-temperature toughness of the base metal steel plate, how to obtain excellent low-temperature toughness of the heat-affected zone (HAZ) under welding conditions is less explained, especially how to ensure the low-temperature toughness of the heat-affected zone (HAZ) when welding with large input energy very few

Method used

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  • High-toughness and high-weather-resistance steel and manufacturing method thereof
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  • High-toughness and high-weather-resistance steel and manufacturing method thereof

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with embodiments and drawings.

[0055] Table 1 shows the composition of the steel in the embodiment of the invention, and Table 2 shows the manufacturing process of the steel in the embodiment of the invention. Table 3 shows the properties of the steel in the example of the invention.

[0056] The process of the embodiment of the present invention is: TDS molten iron deep desulfurization → converter smelting → LF → RH (feeding Si-Ca wire) → continuous casting (using light reduction process) → slab off-line finishing → slab cut-to-length fire cutting → Heating→TMCP→Steel slow cooling→AUT / MUT→Steel edge trimming, cutting head and tail→Sampling and performance test→Cutting steel plate to length→Surface quality and appearance size, marking and testing→Delivery.

[0057] See figure 1 , Which shows the microstructure of the steel plate of Example 5 of the present invention, which is uniform and fine and include...

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Abstract

The invention discloses high-toughness and high-weather-resistance steel and a manufacturing method thereof. The high-toughness and high-weather-resistance steel comprises the following components in percentage by weight: 0.035-0.075% of C, no more than 0.30% of Si, 0.40-0.80% of Mn, 0.07-0.11% of P, no more than 0.004% of S, 0.20-0.50% of Cu, 0.10-0.40% of Ni, 0.40-0.70% of Cr, 0.008-0.016% of Ti, 0.010-0.030% of Nb, no more than 0.0050% of N, 0.001%-0. 004% of Ca, and the balance of Fe and unavoidable impurities, wherein by taking a C-Mn-P component system with low C, low Mn and high P as a foundation and through the alloying of Cu, Ni and Cr, [%C] / [%P] is controlled to be not smaller than 0.49, [%Mn] / [%C] is controlled to be not smaller than 10, the weather resistance index DNH is controlled to be not smaller than 6.50%, [%C]*([%P]+2.5[%S]) is controlled to be not more than 0.0025, [%Ca] / [%S] is controlled to be equal to 1.0-3.0, ([%Cu]+0.36[%Ni]+0.27[%Cr])*[%P] is controlled to be not smaller than 0.030, [%Ca]*[%S]0.28 is controlled to be not more than 0.002, and a TMCP (ThermoMechanical Control Process) is adopted. Therefore, the high-toughness and high-weather-resistance steel has excellent low-temperature toughness, bending cold machining characteristic and high weather resistance, and is suitable to be used as a compartment body structure of a coating-free high-speed train.

Description

Technical field [0001] The invention relates to a high-toughness, high-weathering steel and a manufacturing method thereof, with a yield strength ≥355MPa, a tensile strength ≥490MPa, Charpy transverse impact energy (single value) at -40°C (single value) ≥47J, and a relative corrosion rate of ordinary structural steel ≤ 20%, mainly used for various high-speed train carriage shells. Background technique [0002] As we all know, low-carbon (high-strength) low-alloy steel is one of the most important engineering structural materials, which are widely used in oil and gas pipelines, offshore platforms, shipbuilding, bridge structures, boiler pressure vessels, building structures, automobile industry, railway transportation and machinery In manufacturing. The performance of low-carbon (high-strength) low-alloy steel depends on its chemical composition and the process system of the manufacturing process. Among them, strength, toughness and weldability are the most important properties o...

Claims

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Application Information

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IPC IPC(8): C22C38/50C21D8/02
Inventor 刘自成王广科李先聚
Owner BAOSHAN IRON & STEEL CO LTD
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