A high-performance alloy steel flange and forging and its manufacturing method

An alloy steel, high-performance technology, applied in the field of alloy steel forging, can solve the problems that cannot meet the performance requirements of alloy steel flanges and forgings, achieve the effect of less internal defects, reduce harmful elements, and guarantee performance requirements

Active Publication Date: 2019-10-11
无锡市法兰锻造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is that it cannot meet the performance requirements of alloy steel flanges and forgings for oil and gas pipeline projects and nuclear power projects

Method used

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  • A high-performance alloy steel flange and forging and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: Make a φ900×120mm flange cover, made of 15CrMo alloy steel.

[0043] Acceptance requirements: Rm 480~640MPa, Rp0.2≥280MPa, A≥20%, where A represents the growth rate, and the impact energy is not less than 100J when the impact test is performed at -20°C; the austenite grain size is ≥7 ; According to NB / T47013 for magnetic particle testing and ultrasonic testing, level 1 qualified.

[0044] The specific process flow is:

[0045] Raw material smelting→cutting→forging→heat treatment→sampling→performance testing→nondestructive testing→machining→finished products.

[0046] 1.05 tons of steel ingot were used as raw materials, 15% of the riser end of the ingot was cut off, and 5% of the nozzle end was cut off, and then the steel ingot was smelted. The specific smelting method was electric furnace smelting + refining outside the furnace + vacuum degassing. The chemical composition of the steel ingot is shown in Table 1;

[0047] Table 1 Chemical Composition %

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Abstract

The invention relates to the technical field of alloy steel forging and discloses high-performance alloy steel flanges and forgings and a manufacturing method thereof. Alloy steel comprises the components of, by weight, 0.14%-0.17% of carbon, 0.10%-0.60% of silicon, 0.60%-0.80% of manganese, 0-0.005% of phosphorus, 0-0.003% of sulfur, 1.00%-1.25% of chromium, 0.55%-0.65% of molybdenum, and the balance iron. The forgings produced through the manufacturing process are excellent in performance, the performance index of the forgings far exceeds that of forgings produced through a traditional process, and the defect number and size found in forging nondestructive testing are also far superior to those of the traditional process.

Description

technical field [0001] The invention relates to the technical field of alloy steel forging, in particular to a high-performance alloy steel flange, a forging and a manufacturing method thereof. Background technique [0002] Alloy steel flanges and forgings are widely used in machinery, electric power, petroleum, chemical industry, metallurgy and other fields. Usually, the performance of alloy steel flanges and forgings can meet the relevant standards, but in recent years, with the advancement of technology Accelerated, the performance index design requirements of flanges and forgings used in many projects greatly exceed the requirements of national standards and industry standards, and the technical conditions of customers' orders are significantly higher than these standards. [0003] In the NB / T47008 standard, the chemical composition of 15CrMo is C 0.12%~0.18%, Si 0.10%~0.60%, Mn 0.30%~0.80%, P≤0.025%, S≤0.010%, Cr 0.80%~1.25%, Mo 0.45% to 0.65%, and the rest is Fe eleme...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C33/06C21D1/18B21J5/00
Inventor石宏亮
Owner无锡市法兰锻造有限公司