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Low-yield ratio, high heat input welding, high-strength and high ductility steel plate and method of manufacture

A large input energy welding, low yield ratio technology, applied in the direction of temperature control, etc., can solve the problems that cannot withstand large input energy welding, low temperature toughness can not be achieved, etc.

Active Publication Date: 2008-10-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the yield strength ratio of the steel plate can be greatly reduced by the above method, the low temperature toughness of the steel plate is far from meeting the requirement of -40°C impact energy of 120J, and the steel plate cannot withstand large heat input welding

Method used

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  • Low-yield ratio, high heat input welding, high-strength and high ductility steel plate and method of manufacture
  • Low-yield ratio, high heat input welding, high-strength and high ductility steel plate and method of manufacture
  • Low-yield ratio, high heat input welding, high-strength and high ductility steel plate and method of manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The continuous casting step was carried out according to the chemical composition shown in Table 1, and the thickness of the obtained steel plate was 30mm. Subsequently, the slab is heated at a low temperature, and the heating temperature is 1080°C. Carry out hot rolling reaction afterwards, in the rapid continuous rolling step, the pass reduction rate is 15%, and the cumulative reduction rate is 60%; in the controlled rolling step, the pass reduction rate is 11%, and the cumulative reduction rate The rate is 67%. The finish rolling temperature was 793°C. After the hot rolling reaction is finished, enter the cooling step, the transfer time is 28s, the cooling rate is 15°C / s, and the cooling stop temperature is 572°C. Steel plate properties: see Table 10.

[0039] Table 1 Chemical composition of steel plate in Example 1

[0040]

Embodiment 2

[0042] Steel sheets were manufactured with the chemical compositions shown in Table 2, and the manufacturing process was the same as in Example 1. The thickness of the steel plate is 70mm. The heating temperature of the low-temperature heating of the slab is 1110°C. In the rapid continuous rolling step, the pass reduction rate is 12%, and the cumulative reduction rate is 52%; in the controlled rolling step, the pass reduction rate is 9%, and the cumulative reduction rate is 60%. The finish rolling temperature was 765°C. The transfer time is 46s, the cooling rate is 11°C / s, and the cooling stop temperature is 476°C. Since the steel plate thickness of the newly designed steel 2 is ≥40mm, it needs to be cooled slowly to below 100°C and then naturally air-cooled to room temperature. In this embodiment, the slow cooling end temperature is 90°C. Steel plate properties: see Table 10.

[0043] The chemical composition of table 2 embodiment 2 steel plate

[0044]

Embodiment 3

[0046] Steel sheets were manufactured with the chemical compositions shown in Table 3, and the manufacturing process was the same as in Example 1. The thickness of the steel plate is 50mm. The heating temperature of the low-temperature heating of the slab is 1100°C. In the rapid continuous rolling step, the pass reduction rate is 12%, and the cumulative reduction rate is 55%; in the controlled rolling step, the pass reduction rate is 10%, and the cumulative reduction rate is 67%. The finish rolling temperature was 780°C. The transfer time is 18s, the cooling rate is 12°C / s, and the cooling stop temperature is 547°C. Since the steel plate thickness of the newly designed steel 3 is ≥40mm, it needs to be cooled slowly to below 100°C and then naturally air-cooled to room temperature. In this embodiment, the slow cooling end temperature is 95°C. Steel plate properties: see Table 10.

[0047] The chemical composition of table 3 embodiment 3 steel plate

[0048]

[0049] The...

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Abstract

The invention provides a steel plate having low-temperature toughness, high tensile strength and low yield ratio, as well as a method for making the same. By combining simple combination design of alloying elements with optimized TMCP process, the method successfully solves the problem that low-temperature impact toughness and low yield ratio are in mutual conflict and difficult to reconcile in composition design and process design, which reduces the amount of steel material, saves cost, lightens the dead weight of a steel structure, increases stability and safety, and more importantly, improves the safety, stability and seismic damage resistance of the steel structure. The steel plate can be widely applied to large-scale high-rise building structures, bridge structures, offshore oil production platform structures, low temperature pressure vessels and large-scale ship structures.

Description

technical field [0001] The present invention relates to steel plate material technology, specifically, the present invention relates to low-carbon and low-alloy steel plate material technology, and more specifically, the present invention relates to a steel plate with a low yield strength ratio weldable with large input energy and a manufacturing method thereof. Background technique [0002] As we all know, low-carbon (high-strength) low-alloy steel is one of the most important engineering structural materials, widely used in oil and gas pipelines, offshore platforms, shipbuilding, bridge structures, pressure vessels, building structures, automobile industry, railway transportation and machinery manufacturing. middle. The properties of low-carbon (high-strength) low-alloy steel depend on its chemical composition and the process system of the manufacturing process, among which strength, toughness and weldability are the most important properties of low-carbon (high-strength) ...

Claims

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Application Information

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IPC IPC(8): C22C38/20B22D27/04B21B37/74C21D8/02C21D1/84
Inventor 刘自成施青
Owner BAOSHAN IRON & STEEL CO LTD
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