Alloy reduced ship plate steel with yield strength of 355MPa and preparation process thereof

A technology of yield strength and preparation process, which is applied in the field of alloy reduced-weight ship plate steel with a yield strength of 355MPa and its preparation process, can solve the problems of complex production process and high alloy cost, and achieve high efficiency, low production cost and cheap chemical composition Effect
CN102199724AInactive Publication Date: 2011-09-28INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
Publication Date
2011-09-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides an alloy reduced ship plate steel with yield strength of 355MPa and a preparation process thereof. The ship plate steel comprises the following components in percentage by weight: 0.13 to 0.18 percent of C, 0.10 to 0.35 percent of Si, 0.90 to 1.30 percent of Mn, 0.01 to 0.022 percent of Nb, 0.009 to 0.02 percent of Ti, 0.01 to 0.04 percent of Al, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S and the balance of Fe and impurities. The preparation process comprises: subjecting a continuously cast blank having the same components as the ship plate steel to heating, temperature preservation, hot rolling and cooling to form finished ship plate steel directly; and delivering in a thermo-mechanical control process (TMCP) state. The yield strength of the ship plate steel is over 355MPa, the low-temperature (-20 DEG C) impact toughness is high, and the maximum thickness is 40 millimeters. The alloy reduced ship plate steel is applicable to ship and ocean petroleum platforms, particularly manufacturing process of ship plates with high requirements on strength and low-temperature toughness and a requirement on high welding performance.
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Description

technical field

[0001] The invention particularly relates to an alloy weight-reducing ship plate steel with excellent low-temperature toughness and a yield strength level of 355 MPa and a preparation process thereof. Background technique

[0002] The steel plate with a yield strength of 355MPa is one of the main materials required for ship construction, with a large output and a wide range of uses. On the basis of C-Mn steel, each steel factory adopts different microalloying, such as adding V, Nb, compound Nb-V and compound Nb-Ti in the steel to weld DH36 steel. This type of steel generally adopts two-stage controlled rolling (rough rolling, warming, finishing rolling) and rapid cooling (TMCP) process to produce DH36 steel plate. For Nb-containing steel, the finishing rolling temperature is 830-930°C; for V-containing steel, the finish-rolling starting temperature does not exceed 880°C; the thickness to be heated is 2 to 3.5 times the thickness (t) of the finished product. ...

Claims

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