Cogging and forging method of 2507 super duplex stainless steel casting billet

A duplex stainless steel and billet forging technology, which is applied in metal processing equipment and other directions, can solve the problems that the production method cannot be applied to small ingots, the as-cast dendrite structure is developed, and cracks or cracks are prone to occur, so as to improve plasticity and have no cracks. or cracked, smooth surface effect

Active Publication Date: 2018-08-03
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The PREN value of 2507 super duplex stainless steel is greater than 40, which has excellent corrosion resistance and is especially suitable for use in severe chloride ion corrosion environments. However, due to the high alloy content in 2507 duplex stainless steel, the N content is between 1500 and 3500ppm , the coordinated deformation of austenite and ferrite in the structure at high temperature is prone to surface cracking during hot working
At present, the weight of 2507 steel ingots is generally less than 1.5 tons. Relatively large 2507 super duplex stainless steel ingots, such as 0.75 to 1.5 tons of steel ingots, generally adopt the billet rolling process, such as the "super duplex stainless steel ingot hot rolling process" disclosed in patent number 201310064533. "Production method for processing billets", but this patent is not applicable to small steel ingots. Due to the large differences in size and as-cast structure between the larger 2507 super duplex stainless steel ingots and small steel ingots, the design ideas are different. Usually In the case of large steel ingots, the production method cannot be applied to small steel ingots
[0003] For small steel ingots of 100kg to 300kg, the forging process is mainly used at present, but the as-cast dendritic structure of small steel ingots is well developed, and cracks or cracks are prone to occur during the billet forging process

Method used

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  • Cogging and forging method of 2507 super duplex stainless steel casting billet
  • Cogging and forging method of 2507 super duplex stainless steel casting billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) The 2507 duplex stainless steel slab surface of casting 100kg is peeled off, and the slab surface defect is removed;

[0048] (2) After loading the furnace at 500°C, heat the charged billet from 500°C to 800°C at a heating rate of 62°C / h and keep it warm for 1 hour;

[0049] (3) Heating the billet from 800°C to 950°C at a heating rate of 300°C / h;

[0050] (4) Finally, at a heating rate of 150°C / h, heat the billet from 950°C to 1200°C and keep it warm for 2 hours;

[0051] (5) Forging billet, the cumulative deformation of the first fire forging is 50%, and the final forging temperature is 1100°C;

[0052] (6) According to the size of the material, return to the furnace for an average temperature of 1 hour;

[0053] (7) The cumulative deformation amount of the second fire forging is 50%, and the final forging temperature is 1050°C.

[0054] The surface of the 2507 duplex stainless steel after billet forging is smooth, without cracks and cracks, the surface quality ...

Embodiment 2

[0056] (1) peeling off the surface of the 2507 duplex stainless steel slab for casting 300kg to remove surface defects of the slab;

[0057] (2) After loading the furnace at 600°C, heat the charged billet from 500°C to 800°C at a heating rate of 62°C / h and keep it warm for 0.5 hours;

[0058] (3) Heating the billet from 800°C to 950°C at a heating rate of 200°C / h;

[0059] (4) Finally, heat the billet from 950°C to 1200°C at a heating rate of 110°C / h and keep it warm for 3 hours;

[0060] (5) Forging billet, the cumulative deformation of the first fire forging is 45%, and the final forging temperature is 1150°C;

[0061] (6) According to the size of the material, the average temperature of the furnace should not exceed 1 hour;

[0062] (7) The cumulative deformation of the second fire forging is 55%, and the final forging temperature is 1080°C.

[0063] The surface of the 2507 duplex stainless steel after billet forging is smooth, without cracks and cracks, the surface qual...

Embodiment 3

[0065] (1) The 2507 duplex stainless steel slab surface of casting 200kg is peeled off, and the slab surface defect is removed;

[0066] (2) After loading the furnace at 550°C, heat the charged billet from 500°C to 800°C at a heating rate of 64°C / h and keep it warm for 1.5 hours;

[0067] (3) Then heat the billet from 800°C to 950°C at a heating rate of 250°C / h;

[0068] (4) Finally, at a heating rate of 130°C / h, heat the billet from 950°C to 1200°C and then keep it warm for 2.5 hours;

[0069] (5) Forging billet, the cumulative deformation of the first fire forging is 35%, and the final forging temperature is 1130°C;

[0070] (6) According to the size of the material, return to the furnace for an average temperature of 1 hour;

[0071] (7) The cumulative deformation of the second fire forging is 65%, and the final forging temperature is 1060°C.

[0072] The surface of the 2507 duplex stainless steel after billet forging is smooth, without cracks and cracks, the surface qua...

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Abstract

The invention relates to a cogging and forging method of a 2507 super duplex stainless steel casting billet, belongs to the technical field of hot processing of duplex stainless steel, and solves theproblem that a small steel ingot cracks during the cogging process. The cogging and forging method comprises the following steps: step 1, loading a furnace with 100 kg to 300 kg of the to-be-cast 2507super duplex stainless steel casting billet; step 2, heating the 2507 super duplex stainless steel casting billet by adopting a stepwise heating method; and step 3, carrying out cogging on the heated2507 super duplex stainless steel casting billet by adopting a two-heating-number forging method, wherein the two-heating-number forging method comprises the procedures of first-heating-number forging, in-furnace remelting for temperature equalization as well as second-heating-number forging, and both the finish forging temperature of the first-heating-number forging procedure and the finish forging temperature of the second-heating-number forging procedure are higher than or equal to 1050 DEG C. By adoption of the cogging and forging method provided by the invention, the 2507 super duplex stainless steel casting billet of which the billet surface quality is good can be obtained.

Description

technical field [0001] The invention relates to the technical field of thermal processing of duplex stainless steel, in particular to a blank forging method of 2507 super duplex stainless steel. Background technique [0002] The PREN value of 2507 super duplex stainless steel is greater than 40, which has excellent corrosion resistance and is especially suitable for use in severe chloride ion corrosion environments. However, due to the high alloy content in 2507 duplex stainless steel, the N content is between 1500 and 3500ppm , Coordinated deformation of austenite and ferrite in the structure at high temperature, surface cracking is prone to occur during hot working. At present, the weight of 2507 steel ingots is generally less than 1.5 tons. Relatively large 2507 super duplex stainless steel ingots, such as 0.75 to 1.5 tons of steel ingots, generally adopt the billet rolling process, such as the "super duplex stainless steel ingot hot rolling process" disclosed in patent n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J1/06
CPCB21J1/06B21J5/002
Inventor 陈颖杨忠民王慧敏李昭东曹燕光雍岐龙
Owner CENT IRON & STEEL RES INST
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