E460-W200 ultrahigh-strength ship plate steel and manufacturing method thereof

A manufacturing method and technology for ship plate steel, which are applied in the direction of temperature control, metal rolling, tension/pressure control, etc., can solve the problems of lower temperature, deterioration of low temperature toughness, decreased mechanical properties of welded joints, etc., and achieve cost reduction and excellent welding. The effect of inhibiting the growth of austenite

Inactive Publication Date: 2021-01-08
NANJING IRON & STEEL CO LTD
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Problems solved by technology

[0003] When the welding heat input is greater than 50kJ/cm, it is high-energy welding. When the welding heat input of traditional steel plates is greater than 50kJ/cm, the mechanical properties of the welded joint will be seriously reduced due to the excessive coarsening of the heat-af

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  • E460-W200 ultrahigh-strength ship plate steel and manufacturing method thereof
  • E460-W200 ultrahigh-strength ship plate steel and manufacturing method thereof

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Embodiment Construction

[0026] A kind of E460-W200 ultra-high-strength ship plate steel and its manufacturing method provided in the following examples, the steel plate thickness is 70mm, the chemical composition is shown in Table 1, the rolling cooling process parameters are shown in Table 2, and the product performance is shown in Table 3:

[0027] The main chemical composition (wt%) of the embodiment of table 1

[0028]

[0029] The rolling cooling process parameter of table 2 embodiment

[0030] Example Thickness mm Rough rolling finish temperature ℃ Finish rolling start temperature ℃ Return to red temperature ℃ 1 70 1065 846 510 2 70 1050 820 450 3 70 1081 870 550

[0031] Table 3 embodiment product performance

[0032]

[0033] It can be seen that the comprehensive mechanical properties of the steel plate obtained by the present invention are good, yield strength ≥ 460MPa, tensile strength ≥ 570MPa, suitable for high-strength ship plate steel wi...

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Abstract

The invention discloses E460-W200 ultrahigh-strength ship plate steel which comprises the following chemical components in percent by mass: 0.04-0.12% of C, 0.15-0.35% of Si, 1.30-1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.0030% of S, 0.030-0.060% of V, 0.010-0.030% of Nb, 0.030-0.080% of Alt, 0.005-0.030% of Ti, 0.0005-0.0040% of Ca and less than or equal to 0.0060% of N, wherein (Alt.N)Ti is controlled within 0.010-0.030. For the ship plate steel, the yield strength is greater than or equal to 460 MPa and the tensile strength is greater than or equal to 570 MPa.The manufacturing method is suitable for the high strength ship plate steel, the weld heat input of which is in a range of 200 kJ/cm. The average ballistic work of HAZ of the steel plate at 40 DEG C below zero is over 46 J.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to an E460-W200 ultra-high-strength ship plate steel and a manufacturing method thereof. Background technique [0002] Steels for high heat input welding are widely used. For example, in the shipbuilding industry, the shipbuilding efficiency of ordinary ship plates is only a quarter of that of high heat input welding ship plates. When the country cannot produce it, it can only be imported from abroad, but the price is expensive. The high heat input welding method is the most practical way to improve the efficiency of welding construction and reduce costs. Steel for high heat input welding is one of the key development goals of my country's iron and steel industry and has broad market prospects. [0003] When the welding heat input is greater than 50kJ / cm, it is high-energy welding. When the welding heat input of traditional steel plates is greater than 50kJ / cm, th...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C21C7/06C21C7/10C22C38/14B21B1/46B21B37/48B21B37/74
CPCB21B1/463B21B37/48B21B37/74C21C7/06C21C7/10C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 伯飞虎尹雨群赵晋斌李恒坤车马俊张晓雪邱保文黄建华
Owner NANJING IRON & STEEL CO LTD
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