E550-W100 ultrahigh-strength ship plate steel and manufacturing method thereof

A technology of E550-W100 and manufacturing method, which is applied in the direction of manufacturing tools, metal rolling, furnace types, etc., can solve the problems of deterioration of low-temperature toughness, decline of mechanical properties of welded joints, and lower than other problems, so as to achieve stable production process, improve toughness, cost reduction effect

Inactive Publication Date: 2021-02-05
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • E550-W100 ultrahigh-strength ship plate steel and manufacturing method thereof
  • E550-W100 ultrahigh-strength ship plate steel and manufacturing method thereof

Examples

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Embodiment Construction

[0026] A kind of E550-W100 ultra-high-strength ship plate steel and its manufacturing method provided in the following examples, the steel plate thickness is 50mm, 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 50 1070 826 400 2 50 1053 818 350 3 50 1078 837 450

[0031] Table 3 embodiment product performance

[0032]

[0033] It can be seen that the steel plate obtained by the present invention has good comprehensive mechanical properties, yield strength ≥ 550MPa, tensile strength ≥ 670MPa, suitable for high-strength ship plate steel with weld...

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Abstract

The invention discloses E550-W100 ultrahigh-strength ship plate steel. The E550-W100 ultrahigh-strength ship plate steel comprises the following chemical components in percentage by mass: 0.04%-0.12%of C, 0.15%-0.35% of Si, 1.50%-1.70% 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 to be 0.010 to 0.030. The yield strength of an obtained steel plate is larger than or equal to 550 MPa, the tensile strength of the steel plate is larger than or equal to 670 MPa, the steel plate is suitable for high-strength ship plate steel with the welding line energy within the range of 100 kJ/cm, andthe average impact energy of the HAZ of the steel plate at the temperature of -40 DEG C is 55 J or above.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to an E550-W100 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): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21C7/06C21D6/00C21D8/02C21D9/00C22C33/04B21B1/22
CPCB21B1/22B21B2001/225B21B2261/20C21C7/06C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/001C21D2211/002C21D2211/005C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 赵晋斌李恒坤陈林恒伯飞虎车马俊张晓雪邱保文黄建华
Owner NANJING IRON & STEEL CO LTD
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