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Normalizing vessel steel with 460MPa grade yield strength and manufacturing method thereof

A technology of yield strength and manufacturing method, which is applied in the field of high-strength normalizing container steel, can solve the problems of low yield strength and high cost, and achieve the effects of excellent performance, low production cost and good toughness

Active Publication Date: 2013-08-07
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The steel involved in this patent has Ni, Cu and other alloying elements added, the cost is high, and the yield strength is lower than 460MPa

Method used

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  • Normalizing vessel steel with 460MPa grade yield strength and manufacturing method thereof
  • Normalizing vessel steel with 460MPa grade yield strength and manufacturing method thereof

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with specific embodiments.

[0026] The chemical compositions of Examples 1 and 2 are shown in Table 1. The hot rolling and heat treatment process parameters adopted are: heating temperature 1150-1250°C, heat preservation for 1.5-2.5 hours, starting rolling temperature 980-1150°C, finishing rolling temperature 850-900°C , cooling speed 8~15℃ / s, final cooling temperature 500~700℃, thickness of finished steel plates are 18mm and 15mm respectively, normalizing temperature 860~930℃, holding time 10~60min.

[0027] The steel plate thickness and mechanical properties of Examples 1 and 2 are shown in Table 2.

[0028] Table 1 Chemical composition (wt%) of the normalizing vessel steel involved in Examples 1 and 2 of the present invention

[0029]

C

Si

mn

P

S

Nb

Ti

als

Ceq

Example 1

0.17

0.36

1.51

0.0088

0.0061

0.021

0....

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Abstract

The invention provides a normalizing vessel steel with a 460MPa grade yield strength. The steel comprises the following chemical components by weight: 0.10-0.20% of C, 0.30-0.40% of Si, 1.40-1.80% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.010-0.050% of Nb, 0.010-0.040% of Al, less than or equal to 0.10% and greater than or equal to 0.04% of Ti, and the balance Fe and inevitable impurities. The production process of the steel disclosed in the invention employs two-stage controlled rolling, controlled cooling and normalizing, and the manufactured steel plate has a microstructure composed of ferrites and pearlite, a yield strength of greater than or equal to 460MPa, a tensile strength of greater than or equal to 570MPa, and low temperature toughness of greater than or equal to 100J at -40DEG C. The steel provided in the invention has excellent obdurability and comprehensive performance, and can be used for manufacturing spherical gas storage tanks, liquefied gas tankers and the like.

Description

technical field [0001] The invention particularly relates to a high-strength normalizing container steel, in particular to a normalizing container steel with a yield strength of 460 MPa and a manufacturing method thereof. Background technique [0002] Normalized pressure vessel steel is widely used in petroleum, chemical, energy and other fields to manufacture various spherical gas storage tanks (such as oxygen, nitrogen, ethane, propylene, etc.) and liquefied gas tankers (such as propane, propylene, di methyl ether, liquid ammonia, methylamine, acetaldehyde, etc.). With the development of large-scale and high-parameterization of pressure vessels, the design, manufacture and use of pressure vessels have higher and higher requirements for steel for pressure vessels. It is not only necessary to gradually increase the strength of steel plates to reduce vessel wall thickness or increase Volume, but also requires excellent low temperature toughness and welding performance. At p...

Claims

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Application Information

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IPC IPC(8): C22C38/50C21D1/28C22C38/14C21D8/00
Inventor 杨汉王西霞镇凡曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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