Production Technology of Large Unit Weight Extra Thick Chromium Molybdenum Steel Plate

A production process and large single-weight technology, applied in the field of metallurgy, can solve the problems of single-weight steel plate, blank or steel plate judgment, and fracture.

Active Publication Date: 2020-10-30
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the excessive weight and thickness of the steel plate produced by the "forging + rolling" method, as well as the width and length of the steel plate, it is necessary to consider the precise connection of various important processes, otherwise it is very easy to cause unplanned
For example, after forging, the billet is cooled and put directly into the furnace for heating and rolling. The billet or steel plate is easily cracked or even broken, which directly leads to the scrapping of the billet or steel plate, and serious loss of manpower and material resources.

Method used

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  • Production Technology of Large Unit Weight Extra Thick Chromium Molybdenum Steel Plate
  • Production Technology of Large Unit Weight Extra Thick Chromium Molybdenum Steel Plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: The production process of this large single-weight and extra-thick chromium-molybdenum steel plate is as follows.

[0015] The steel grade is SA387Gr22CL2, the forging ingot is heated to 1250°C and forged into a forging billet with a weight of 95t. The forged billet is put into the furnace at 25°C and slowly raised to 180°C for 4 hours at a heating rate of 30°C / h, followed by heating at a rate of 50°C / h to 400°C for 10 hours, and then released from the furnace. Heating after coming out of the furnace, the heating temperature is 1310°C, the soaking temperature is 1300°C, and the holding time is 10h. Then rolling is carried out at a rolling start temperature of 1100° C., and rolled into a steel plate with a thickness of 420 mm and a weight of 62 t. After testing, there are no defects such as cracks and cracks in the blanks and finished steel plates, and the surface quality is good.

Embodiment 2

[0016] Embodiment 2: The production process of this large single-weight and extra-thick chromium-molybdenum steel plate is as follows.

[0017] For steel type 10CrMo9-10, the forging ingot is heated to 1250°C and forged into a forging billet with a weight of 100t. The forged billet is put into the furnace at 75°C and slowly raised to 190°C for 4.5 hours at a heating rate of 29°C / h, followed by heating at a rate of 49°C / h to 430°C for 11 hours, and then released from the furnace. Heating after coming out of the furnace, the heating temperature is 1300°C, the soaking temperature is 1280°C, and the holding time is 11h. Rolling is then carried out at a rolling start temperature of 1080°C to form a steel plate with a thickness of 450mm and a weight of 65t. After testing, there are no defects such as cracks and cracks in the blanks and finished steel plates, and the surface quality is good.

Embodiment 3

[0018] Embodiment 3: The production process of the large single-weight and extra-thick chromium-molybdenum steel plate is as follows.

[0019] For the steel type 10CrMo910, the forging ingot is heated to 1250°C and forged into a forging billet with a weight of 107t. The forged billet is put into the furnace at 100°C and slowly raised to 200°C for 5 hours at a heating rate of 28°C / h, followed by heating at a rate of 48°C / h to 450°C for 12 hours, and then released from the furnace. Heating after coming out of the furnace, the heating temperature is 1330°C, the soaking temperature is 1290°C, and the holding time is 12h. Then rolling is carried out at a rolling start temperature of 1140° C., and rolled into a steel plate with a thickness of 500 mm and a weight of 70 t. After testing, there are no defects such as cracks and cracks in the blanks and finished steel plates, and the surface quality is good.

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Abstract

The invention discloses a production process of a large-piece-weight extra-thick chromium molybdenum steel plate. The production process comprises the steps of forging, preheating, heating and rolling, wherein the preheating procedure comprises the steps of heating a forged blank to 180-200 DEG C at a heating rate of less than or equal to 30 DEG C / h after the forged blank is placed in a furnace, simmering the steel for 4-5 hours with soft fire, then heating the steel in the furnace with the temperature raised to 400-450 DEG C at a heating rate of less than or equal to 50 DEG C / h, keeping thetemperature for more than or equal to 10 hours, and discharging the steel plate from the furnace. After the process is adopted, the blank and the finished steel plate do not have defects such as rupture and cracking, forging defects such as surface cracks, slag inclusion and internal tearing are effectively eliminated, and the forged blank and the steel plate have smooth surfaces, good quality andwide application value.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a production process of a large single-weight extra-thick chromium-molybdenum steel plate. Background technique [0002] The large unit weight and extra-thick chrome-molybdenum steel plate produced by the combination of "forging + rolling" meets the domestic petrochemical industry's demand for plates for key equipment in coal chemical and petrochemical industries such as thick-walled hydrogenation reactors. It is of great practical significance to break the monopoly of foreign countries and reduce the cost of extra-thick chromium-molybdenum steel plates using traditional forging methods. However, due to the excessive weight and thickness of the steel plate produced by the "forging + rolling" method, as well as the width and length of the steel plate, the precise connection of various important processes must be considered, otherwise it is very easy to go unplanned. For exampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J1/06B21B1/38B21B45/00B21B37/74B21B37/00
CPCB21B1/38B21B37/00B21B37/74B21B45/004B21B2001/386B21J1/06
Inventor 邓建军李建朝李样兵吴艳阳牛红星尹卫江袁锦程李杰龙杰柳付芳候敬超王东阳
Owner WUYANG IRON & STEEL
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