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Forging technology of Hastelloy C-276

A C-276, Hastelloy technology, applied in the field of metal forging technology, can solve problems such as affecting the production progress and yield of materials, reducing material thermoplasticity, and small forging temperature window, so as to improve production and processing efficiency, eliminate forging cracking, The effect of saving forging time

Active Publication Date: 2019-04-09
HEBEI IRON AND STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hastelloy C-276 has a broad application market, but its production is severely limited, one of the important factors is the hot working of Hastelloy C-276
During the hot forging process of Hastelloy C-276, due to the small forging temperature window, the optimum temperature range is 1000-1150 °C. When the temperature is lower than this temperature range, precipitated phases will be rapidly generated at the grain boundaries, resulting in grain Boundary brittleness, reducing the thermoplasticity of the material, a little carelessness, there will be forging cracking, which seriously affects the production progress and yield of the material

Method used

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  • Forging technology of Hastelloy C-276
  • Forging technology of Hastelloy C-276
  • Forging technology of Hastelloy C-276

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The forging process of the Hastelloy C-276 is specifically as follows.

[0024] (1) Hastelloy C-276 electroslag casting ingot, the size is Φ300×500mm, the composition is (wt): Fe 5.32%, Cr16.23%, Mo 16.45%, W 3.83%, Mn 0.53%, C 0.008% , Si 0.03%, P 0.004%, S 0.003%, and the balance is Ni.

[0025] (2) First, heat treat Hastelloy C-276. The original temperature of the heating furnace is 36°C. Set the program to raise the temperature to 1000°C at a heating rate of 300°C / h and keep it for 1 hour; then raise the temperature to 100°C / h. 1100°C, keep warm for 15 hours, and air cool after taking out the oven. Before forging, put the Hastelloy C-276 into the heating furnace in front of the forging press for heating, raise the temperature to 1000℃ at a heating rate of 300℃ / s, and keep it for 1h; then raise it to 1150℃ at a heating rate of 100℃ / s, and keep it Start forging after 5h.

[0026] (3) Turn on the temperature replenishing device during forging, and spra...

Embodiment 2

[0028] Example 2: The forging process of the Hastelloy C-276 is as follows.

[0029] (1) Cast Hastelloy C-276, size 150×150×300mm, composition (wt): Fe 5.49%, Cr 15.88%, Mo 15.85%, W 3.73%, Mn 0.50%, C 0.006% , Si 0.05%, P 0.005%, S 0.005%, and the balance is Ni.

[0030] (2) Use a heating furnace to heat-treat the material. The original temperature of the heating furnace is 53°C. Set the program to raise the temperature to 990°C at a heating rate of 250°C / h and keep it for 1.5h; then raise the temperature to 1110°C at 80°C / h , keep warm for 15.5 hours, take out the oven and air cool. Before forging, put the Hastelloy C-276 into the heating furnace before the forging press for heating, raise the temperature to 1010°C at a heating rate of 200°C / s, and keep it for 1.2h; then raise the temperature to 1160°C at a heating rate of 90°C / s, Start forging after 5.5 hours of heat preservation.

[0031] (3) Turn on the temperature replenishing device during forging, spray nozzles from...

Embodiment 3

[0033]Embodiment 3: The forging process of the Hastelloy C-276 is as follows.

[0034] (1) As-cast Hastelloy C-276, the billet size is 150×150×260mm, the composition is (wt): Fe 5.69%, Cr16.03%, Mo 16.12%, W 3.92%, Mn 0.55%, C 0.008 %, Si 0.06%, P 0.004%, S 0.003%, and the balance is Ni.

[0035] (2) Use a heating furnace to heat-treat the material. The original temperature of the heating furnace is 73°C. Set the program to raise the temperature to 1010°C at a heating rate of 200°C / h and keep it for 1.2h; then raise the temperature to 1080°C at 90°C / h , keep warm for 16 hours, take out the oven and air cool. Before forging, put the Hastelloy C-276 into the heating furnace before the forging press for heating, raise the temperature to 1020°C at a heating rate of 250°C / s, and keep it for 1.3h; then raise the temperature to 1155°C at a heating rate of 80°C / s, Start forging after 6 hours of heat preservation.

[0036] (3) Turn on the temperature compensation device during forgi...

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Abstract

The invention discloses a forging technology of a Hastelloy C-276. The forging technology comprises a pre-forging heat treatment process, a heating process and a forging process. The pre-forging heattreatment process is characterized in that an alloy material is heated to 980 DEG C-1020 DEG C, and heat is preserved for 1-1.5 hours; the material is heated to 1080 DEG C-1120 DEG C again, and heat is preserved for 15-16 hours; and the material is taken out of a furnace for air cooling. The heating process is characterized in that the alloy material is heated to 980 DEG C-1020 DEG C, and heat ispreserved for 1-1.5 hours; and the material is heated to 1140 DEG C-1160 DEG C again, and heat is preserved for 5-6 hours. The forging process is characterized in that multi-heating-number forging isadopted, wherein a temperature compensation device of a forging machine is adopted for heating during forging, and the final forging temperature of each heating number is controlled to be 1000 DEG C or above. According to the technology, a heat treatment technology is adopted, a precipitated phase of the Hastelloy C-276 is redissolved, so that grain boundary embrittlement is reduced, and forging cracks caused by weakening of grain boundary are eliminated; and the temperature compensation device is used for carrying out temperature compensation on the material in the forging process, so that the staying time of a blank in the forging temperature interval is prolonged, and then the forging time of each heating number is prolonged.

Description

technical field [0001] The invention relates to a metal forging process, in particular to a Hastelloy C-276C forging process. Background technique [0002] As an important member of nickel-based alloy, Hastelloy C-276C has super corrosion resistance because it contains a large amount of nickel, chromium, molybdenum and tungsten elements, and has strong corrosion resistance in oxidizing and reducing media Ability, while taking into account good mechanical properties, known as the "king of corrosion resistance". Hastelloy C-276 is suitable for corrosive environments in many fields such as chemical manufacturing, power plant flue gas desulfurization, papermaking, and marine; therefore, it is also known as one of the most widely used nickel-based corrosion-resistant alloys. Hastelloy C-276 has a broad application market, but its production is severely limited, one of the important factors is the hot working of Hastelloy C-276. During the hot forging process of Hastelloy C-276,...

Claims

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Application Information

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IPC IPC(8): B21J1/06B21J5/00B21K29/00
CPCB21J1/06B21J5/00B21K29/00
Inventor 赵英利张雲飞嵇爽韩彦光陈文王学慧
Owner HEBEI IRON AND STEEL
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