Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Composite microalloyed high-strength steel forge piece with tensile strength of 700 MPa and production method thereof

A micro-alloying and tensile strength technology, applied in the field of high-strength low-alloy steel production, can solve the problems of poor plasticity and low-temperature toughness, low elongation, poor low-temperature toughness, etc. Effect of carbon content

Active Publication Date: 2014-09-10
HEFEI GENERAL MACHINERY RES INST
View PDF5 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-carbon low-alloy steel products produced by the above-mentioned thin strip continuous casting method have high strength, but the main problem is that the elongation of the product is not high and the low-temperature toughness is poor
Since the hot rolling reduction rate of the thin strip continuous casting process usually does not exceed 50%, the effect of refining austenite grains by deformation is not good, so the plasticity and low temperature toughness of this type of steel are poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite microalloyed high-strength steel forge piece with tensile strength of 700 MPa and production method thereof
  • Composite microalloyed high-strength steel forge piece with tensile strength of 700 MPa and production method thereof
  • Composite microalloyed high-strength steel forge piece with tensile strength of 700 MPa and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] In order to achieve the above purpose, the present invention designs a brand-new vanadium-niobium-titanium composite microalloyed high-strength steel forging with a tensile strength of 700MPa. The forging is composed of the following chemical components: C: 0.07-0.12%; Mn: 1.2-1.8%; Si: 0.2~0.4%; S≤0.006%; P≤0.015%; Ni: 1.3~1.8%; Cr: 0.15~0.3%; Mo: 0.2~0.4%; Nb: 0.02~0.1%; V≤0.1%; Ti: ≤0.02%; Cu≤0.25%; B: ≤0.001%, the rest is Fe and unavoidable impurities; at the same time, the welding crack sensitivity index of forgings is P cm ≦0.26%.

[0041] Weld crack sensitivity index P cm Determine according to the following formula:

[0042] P cm =C+Si / 30+Ni / 60+(Mn+Cr+Cu) / 20+Mo / 15+V / 10+5B (%).

[0043] The added alloy elements of the present invention are based on the following principles:

[0044] C: 0.07 to 0.12%. C is the most effective element to improve the strength of steel. With the increase of carbon content, the amount of Fe3C in steel increases, and the tensile s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a composite microalloyed high-strength steel forge piece with tensile strength of 700 MPa and a production method thereof, and relates to a low-welding crack sensitivity high-strength steel forge piece with tensile strength of 700 MPa and a production method thereof. The forge piece comprises the following chemical components in percentage by weight: 0.07-0.12% of C, 1.2-1.8% of Mn, 0.2-0.4% of Si, not more than 0.006% of S, not more than 0.015% of P, 1.3-1.8% of Ni, 0.15-0.3% of Cr, 0.2-0.4% of Mo, 0.02-0.1% of Nb, not more than 0.1% of V, not more than 0.02% of Ti, not more than 0.25% of Cu, and not more than 0.001% of B, the balance being Fe and inevitable impurities; and Pcm is not more than 0.26%. The plate thickness of the forge piece can reach up to 200 mm; and the mechanical performance of the force piece satisfies the following conditions: the yield strength is not less than 560 MPa; the tensile strength is not less than 700 MPa; the elongation is not less than 17%; and KV2 (-40 DEG C) is not less than 80 J.

Description

technical field [0001] The invention belongs to the field of high-strength low-alloy steel production, and in particular relates to a high-strength steel forging with a tensile strength of 700 MPa and low welding crack sensitivity and a production method thereof. Background technique [0002] With the rapid development of my country's metallurgical industry and major projects such as "West-to-East Electricity Transmission" and "West-to-East Gas Transmission", quenched and tempered high-strength steel and forgings are widely used in pressure steel pipes for power generation, volute casings of hydroelectric units, Natural gas storage tanks and gas storage gas tanks for complete metallurgical equipment have been widely used in the construction, and the demand is increasing year by year. The application requirements for higher strength quenched and tempered steel and its supporting forgings are also increasingly urgent. [0003] Chinese patent application number: 200910063768.2 d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54C22C38/50C22C38/48C21D1/25C21D8/00
Inventor 徐亮江慧丰方国爱汪辉章敏王利闫永超
Owner HEFEI GENERAL MACHINERY RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products