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Welding bottle steel hot-rolled strip hp295 and its manufacturing method

A manufacturing method and technology of hot-rolled plates, applied in the direction of metal rolling, etc., can solve the problems of poor comprehensive mechanical properties of hot-rolled steel strips for welding bottles, affecting the safety of welding bottles, etc. The effect of good performance index and stable stamping performance

Active Publication Date: 2022-07-22
LIUZHOU IRON & STEEL CO LTD +1
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Problems solved by technology

[0004] To sum up, the following problems exist in the prior art: the comprehensive mechanical properties of the hot-rolled steel strip for welding bottles are poor, which affects the safety of welding bottles

Method used

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  • Welding bottle steel hot-rolled strip hp295 and its manufacturing method
  • Welding bottle steel hot-rolled strip hp295 and its manufacturing method
  • Welding bottle steel hot-rolled strip hp295 and its manufacturing method

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[0032] The manufacturing method of the high-quality welding bottle steel hot-rolled strip HP295 of the present invention adopts the following composition ratio and specific process. Among them, Table 1 is the composition (by weight percent) of the steel of each example. Table 2 is the process parameters corresponding to the example steels described in Table 1. Table 3 shows the mechanical properties corresponding to the component steels described in the examples in Table 1. The metallographic structure of the steel strip after rolling is equiaxed F+GB+P, and the grain size is uniform (see figure 2 , figure 2 It is a photo of the metallographic structure of Example 1 of the present invention, and the content ratios of F, GB, and P are: 75%, 21%, and 4%, respectively. ).

[0033] Table 1 Chemical composition of products (wt%)

[0034] example C Si Mn P S Alt Ti N Example 1 0.145 0.038 0.78 0.015 0.007 0.033 0.016 0.0030 Example 2 0...

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Abstract

The invention provides a hot-rolled strip HP295 of welding bottle steel and a manufacturing method thereof. The chemical composition weight percentage of the hot-rolled strip HP295 of the welding bottle steel is: C: 0.13-0.16wt%, Si≤0.07wt%, Mn: 0.70-1.00wt%, P≤0.020wt%, S≤0.010wt%, Alt: 0.020-0.050wt%, N≤0.0050wt%, Ti: 0.010-0.020wt%; the balance is Fe and unavoidable trace elements; the specifications of the hot-rolled strip HP295 of the welding bottle steel are: thickness 2mm to 8mm; the yield ratio of the hot-rolled strip of the welding bottle steel is controlled at 0.65-0.75, and the 180° cold bending performance is 100% qualified. The above-mentioned manufacturing method adopts the composition and specification of the hot-rolled strip of welding bottle steel HP295. The invention can obtain high-quality welding bottle steel hot-rolled strip HP295 with good comprehensive mechanical index, stable stamping performance and high safety in use.

Description

technical field [0001] The invention relates to the field of steel rolling, in particular to a welding bottle steel hot-rolled strip HP295 and a manufacturing method thereof. Background technique [0002] Welding cylinder steel products are mainly used in liquefied gas cylinders, oxygen cylinders, etc. [0003] The grade HP295 in the national standard GB 6653 "Steel Plates and Strips for Welding Gas Cylinders" requires yield strength R eL ≥295MPa, tensile strength R m It is 440~560MPa, the elongation A ≥ 26%, the yield ratio ≤ 0.8, and the performance of 180° cold bending (d=2a) is qualified. The yield strength ratio refers to the ratio of the yield strength to the tensile strength of the material. If the yield strength ratio is too high, the structure is brittle failure. Because the structure does not have obvious deformation during failure, it is difficult to prevent it. Therefore, brittle failure is strictly prohibited in civil engineering. As a special purpose for sto...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14B21B1/02C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/14C22C33/04C21D8/0226C21D8/0205C21D8/0263C21D8/0247C21D11/005B22D11/001B22D11/18B21B37/74C21D2211/005C21D2211/009Y02P10/20
Inventor 李宗强樊雷李显廖耀俊赵忠云陈友操陈思
Owner LIUZHOU IRON & STEEL CO LTD
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