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A kind of niobium microalloyed low-temperature high-performance steel and its preparation method

A micro-alloying, high-performance technology, applied in the field of steel manufacturing, can solve the problems of frequent failures of mechanical equipment, potential safety hazards, and complex surface hardening treatment process.

Active Publication Date: 2019-01-29
KEEN OFFSHORE ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time, most of the steel used in the core components of heavy machinery equipment needs to undergo surface hardening treatment to improve the wear resistance of steel used in equipment. However, the surface hardening treatment process of 980MPa high-strength steel in heavy machinery equipment is complicated and costly, which is not conducive to national industrial energy conservation. emission reduction
In the harsh environment of low temperature (-40°C), steel will become brittle, which will cause frequent failures of mechanical equipment, and even make them unusable, bringing safety hazards

Method used

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  • A kind of niobium microalloyed low-temperature high-performance steel and its preparation method
  • A kind of niobium microalloyed low-temperature high-performance steel and its preparation method
  • A kind of niobium microalloyed low-temperature high-performance steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0081] The niobium microalloyed low temperature high performance steel was prepared according to the following steps:

[0082] Step 1: put the niobium microalloy billet shown in Table 1 into a 50kg vacuum induction furnace for smelting, and make a small round billet, heat the niobium microalloy billet to 1200°C with the furnace, and pre-heat for 3 hours.

[0083] Step 2, then forging the niobium microalloyed steel billet on the forging machine:

[0084] (2.1) First carry out rough forging to described niobium microalloy steel billet, the opening forging temperature of rough forging is controlled at 1200 ℃, the final forging temperature of rough forging is controlled at 1100 ℃, the niobium microalloy steel billet is forged from a diameter of 100mm into a diameter 80mm, to obtain the initial forging billet.

[0085] (2.2) Diffusion annealing and heat preservation were performed on the initially forged billet at a temperature of 1100° C. for 1.5 hours to obtain a hot forged bill...

Embodiment A2

[0093] The niobium microalloyed low temperature high performance steel was prepared according to the following steps:

[0094] Step 1: put the niobium microalloy billet shown in Table 1 into a 50kg vacuum induction furnace for smelting, and make a small round billet, heat the niobium microalloy billet to 1250°C with the furnace, and pre-heat for 1.5h.

[0095] Step 2, then forging the niobium microalloyed steel billet on the forging machine:

[0096] (2.1) First carry out rough forging to described niobium micro-alloy steel billet, the opening forging temperature of rough forging is controlled at 1150 ℃, the final forging temperature of rough forging is controlled at 1200 ℃, the niobium micro-alloy steel billet is forged from a diameter of 100 mm into a diameter 75mm, to obtain the initial forging billet.

[0097] (2.2) Diffusion annealing and heat preservation are performed on the initially forged billet at a temperature of 1160° C. for 1.5 hours to obtain a hot forged bille...

Embodiment A3

[0105] The niobium microalloyed low temperature high performance steel was prepared according to the following steps:

[0106] Step 1: put the niobium microalloy billet shown in Table 1 into a 50kg vacuum induction furnace for smelting, and make a small round billet, heat the niobium microalloy billet to 1260°C with the furnace, and pre-heat for 2 hours.

[0107] Step 2, then forging the niobium microalloyed steel billet on the forging machine:

[0108] (2.1) First carry out rough forging to described niobium microalloy steel billet, the opening forging temperature of rough forging is controlled at 1200 ℃, the final forging temperature of rough forging is controlled at 1100 ℃, the niobium microalloy steel billet is forged from a diameter of 100mm into a diameter 70mm, to obtain the initial forging billet.

[0109] (2.2) Diffusion annealing and heat preservation are performed on the as-forged billet at a temperature of 1150° C. for 2 hours to obtain a hot-forged billet.

[0110...

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Abstract

The invention discloses a niobium microalloyed low-temperature high-performance steel and a preparation method thereof, comprising the following steps: Step A, heating the niobium microalloy steel billet to 800-900°C, and keeping it warm for 1.2-1.5h; The heat preservation treated niobium microalloyed billet is quenched to obtain the niobium microalloyed low-temperature high-performance steel. The niobium microalloyed low-temperature high-performance steel is a high-strength steel of 980MPa and above, which still maintains high strength, high elongation, and high impact toughness in a low-temperature environment (-40°C), and will not produce brittleness; make full use of Nb The role of refining austenite primary grains, the niobium micro-alloyed steel billet is firstly subjected to diffusion annealing treatment at 1100-1200 ° C, followed by bainite phase transformation heat treatment to improve the composition and uniformity of the steel billet, and its tensile strength is above 1000 MPa , the elongation after fracture is between 12% and 20%, AKV (‑40°C) ≥ 69J, which meets the technical composition requirements of products with heavy load and impact toughness.

Description

technical field [0001] The invention relates to the field of steel production, in particular to a niobium microalloyed low-temperature high-performance steel and a preparation method thereof. Background technique [0002] With the continuous improvement of the use area and safety requirements of heavy machinery and equipment in the world, high-strength steels of 980MPa and above have been increasingly used in core components of machinery and equipment to prolong equipment life and improve equipment safety, reduce The effect of maintenance costs. The forged high-strength steel is favored by the heavy machinery industry because of its high strength, high elongation, high impact toughness, and easy processing and many other advantages in low temperature environments (-40°C). [0003] At the same time, most of the steel used in the core components of heavy machinery equipment needs to undergo surface hardening treatment to improve the wear resistance of steel used in equipment....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/48C22C38/46C22C38/42C22C38/02C22C38/04C21D6/00C21D8/00
CPCC21D6/004C21D6/005C21D6/008C21D8/005C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48
Inventor 许正中吕明柯杨清峡邓达纮吴平平陈峰王冬石张静波
Owner KEEN OFFSHORE ENG CO LTD