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Alloy steel plate for pressure vessel and manufacturing method of alloy steel plate

A pressure vessel and alloy steel plate technology, applied in the field of metal material manufacturing, can solve the problems of high yield ratio and small difference, and achieve the effects of low yield ratio, reduced yield ratio, good high temperature performance and welding performance

Inactive Publication Date: 2015-06-17
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Steel with a single structure is easy to obtain high yield strength and tensile strength, but usually the difference between the two is not large, so the yield ratio is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: produce alloy steel plate for pressure vessel, its thickness is 50mm

[0029] 1. The chemical composition is (percentage by weight): carbon (C) 0.24%, silicon (Si) 0.90%, manganese (Mn) 1.35%, phosphorus (P) 0.012%, sulfur (S) 0.003%, chromium (Cr) 0.55 %, the balance is iron and unavoidable impurities.

[0030] 2. Preparation process:

[0031] It adopts top-bottom combined blowing converter smelting, LF+VD or RH external refining, slab continuous casting, slab reheating, slab rolling and other processes for production.

[0032]It is smelted in a converter with top-bottom combined blowing, with an alkalinity of 3.5 and an end point: C: 0.09%, P: 0.010%, S: 0.008%. Add slag-stop rods and slag-stoppers to stop slag when tapping, and strictly control the slag from the converter. The tapping time is 6 minutes, and the ladle is guaranteed to be blown with argon throughout the tapping process. Deoxidation alloying: the alloy is added before 4 / 5 of tapping, a...

Embodiment 2

[0039] Embodiment 2: the alloy steel plate that produces pressure vessel, its thickness is 20mm

[0040] 1. The chemical composition of the steel plate is (weight percentage): carbon (C) 0.23%, silicon (Si) 0.80%, manganese (Mn) 1.30%, phosphorus (P) 0.013%, sulfur (S) 0.005%, chromium (Cr ) 0.50%, the balance is iron and unavoidable impurities,

[0041] 2. Preparation process:

[0042] It adopts top-bottom combined blowing converter smelting, LF+VD or RH external refining, slab continuous casting, slab reheating, slab rolling and other processes for production.

[0043] It is smelted in a converter with top-bottom combined blowing, with an alkalinity of 3.2 and an end point: C: 0.10%, P: 0.009%, S: 0.006%. Add slag-stop rods and slag-stoppers to stop slag when tapping, and strictly control the slag from the converter. The tapping time is 6 minutes, and the ladle is guaranteed to be blown with argon throughout the tapping process. Deoxidation alloying: the alloy is added b...

Embodiment 3

[0050] Embodiment 3: produce alloy steel plate for pressure vessel, its thickness is 6mm

[0051] 1. The chemical composition of the steel plate is (percentage by weight): carbon (C) 0.21%, silicon (Si) 0.75%, manganese (Mn) 1.25%, phosphorus (P) 0.013%, sulfur (S) 0.004%, chromium (Cr ) 0.40%, the balance is iron and unavoidable impurities,

[0052] 2. Preparation process:

[0053] It adopts top-bottom combined blowing converter smelting, LF+VD or RH external refining, slab continuous casting, slab reheating, slab rolling and other processes for production.

[0054] It is smelted in a converter with top-bottom combined blowing, with an alkalinity of 3.0 and an end point: C: 0.06%, P: 0.008%, S: 0.005%. Add slag-stop rods and slag-stoppers to stop slag when tapping, and strictly control the slag from the converter. The tapping time is 4 minutes, and the ladle is guaranteed to be blown with argon throughout the tapping process. Deoxidation alloying: the alloy is added befor...

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Abstract

The invention relates to an alloy steel plate for a pressure vessel and a manufacturing method of the alloy steel plate. The alloy steel plate comprises the following components in percentage by weight: 0.21-0.24 percent of carbon, 0.75-0.95 percent of silicon, 1.25-1.35 percent of manganese, 0-0.020 percent of phosphorus, 0-0.010 percent of sulfur, 0.40-0.55 percent of chromium and ferrum and inevitable impurities in balancing mount. The alloy steel plate is produced by top and bottom combined blown converter smelting, LF+VD or RH external refining, slab continuous casting, slab reheating, slab rolling and other processes. The yield strength of the alloy steel plate is greater than or equal to 325MPa, the tensile strength is s greater than or equal to 585MPa, the yield ratio is less than or equal to 0.75, and the high-temperature performance Rp0.2 at 350DEG C is great than or equal to 220MPa. The alloy steel plate has the advantages of high strength, low yield ratio, favorable high-temperature performance, favorable welding performance and the like; and the using safety of the pressure vessel made of the alloy steel plate in a high-temperature environment is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to an alloy steel plate for a pressure vessel and a manufacturing method thereof. Background technique [0002] With the rapid development of the national economy, the technologies of power generation, metallurgy, chemical industry, food, and papermaking continue to improve, and the demand for high-temperature-resistant materials has increased significantly, especially the demand for alloy steel plates for pressure vessels used in high-temperature environments. [0003] The long-term use of steel plates in high-temperature environments requires high-temperature-resistant durable strength and durable plasticity, good oxidation resistance and corrosion resistance, and sufficient toughness, machinability, weldability and structural stability. [0004] In order to solve the above problems, it is generally used to add precious alloys such as Cr, Mo, Ni, V...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C33/04C21D8/02
CPCC21D8/0226C22C38/02C22C38/04C22C38/18
Inventor 蒋善玉夏茂森刘晓东周兰聚冯勇彭海红胡新亮张尔康
Owner SHANDONG IRON & STEEL CO LTD