A kind of process method of manufacturing carbon steel gate valve gate

A process method and gate valve technology, which is applied in the field of gate valves, can solve the problems of less than 11.5% Cr content, uneven hardness on the seal, and hardness not up to the standard, so as to increase wear resistance and shorten the production time of products. Cycle, strength-enhancing effects

Active Publication Date: 2018-06-12
SHANGHAI YUANGAO VALVE IND (GRP) CO LTD
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a process method for manufacturing carbon steel gate valve gate plate, by adopting CA15 material to make carbon steel gate valve gate plate, solve the carbon steel gate valve gate plate made of traditional ASTM A216WCB material in surfacing welding 1Gr13, (D507) For welding consumables, the hardness error is large, the hardness on the seal is uneven, the hardness does not meet the standard, and the Cr content is less than 11.5% of the standard.

Method used

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  • A kind of process method of manufacturing carbon steel gate valve gate
  • A kind of process method of manufacturing carbon steel gate valve gate

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Embodiment 1

[0025] Such as figure 1 Shown, a kind of technological method of manufacturing carbon steel gate valve disc, which comprises the following steps:

[0026] 1. Select the ASTM A487 / A487M standard CA15 material as the casting material, and the Cr content in the CA15 material is 11.5-14%;

[0027] 2. Cast the casting material selected in step 1 into a gate valve gate;

[0028] 3. After the casting is completed, the gate valve plate is quenched. The quenching temperature is 1030°C±10°C, and the holding time is 2.5min / mm;

[0029] 4. Temper the quenched gate valve gate, the tempering temperature is 460°C±10°C, and the holding time is 3min / mm; 5. Cool the tempered gate valve gate by oil cooling or water cooling, after cooling The Cr content of the gate valve plate is 11.5%-14%, and the hardness is HRC40-42.

[0030] In order to solve the problem of Cr less than 11.5% on the sealing surface of the ram, the hardness is not balanced, and the hardness and other problems, the material...

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Abstract

The invention relates to a technological method for manufacturing a carbon steel gate valve and gate. The technological method comprises the following steps: (a) selecting ASTM A487 / A487 standard CA15 materials as casting materials; (b) casting the casting materials selected in the step (a) into gate valve and gates; (c) quenching the cast gate valve and gates at the quenching temperature of 1030+ / -10 DGE C for 2.5min / mm; (d) tempering the quenched gate valve and gates at the tempering temperature of 460+ / -10 DGE C for 3min / mm; and (e) performing oil cooling or water cooling to the tempered gate valve and gates. Compared with the prior art, the technological method has the advantages of omitting two rough turning procedures for reducing turnover procedures of workpieces, reducing two bead welding procedures for saving welding materials and decreasing the turnover procedures of the workpieces, ensuring the content of Cr to be greater than or equal to 11.5%, and ensuring the consistent hardness of sealing surfaces to be HRC40-42.

Description

technical field [0001] The invention belongs to the technical field of gate valve gates, in particular to a process for manufacturing carbon steel gate valve gates. Background technique [0002] The existing carbon steel gate valve gate material is ASTM A216WCB (such as figure 2 As shown), the gate valve gate is the closing part of the gate valve, and both sides of the gate need to be surfacing welding 1Gr13, (D507) welding material. Requirements: hardness HRC≧40, thickness of surfacing layer after processing≧3mm (side surface), Cr content≧11.5%. The surfacing welding process requires that the ram be rough-turned first to ensure that the included angle is 10° (5° on one side), and then perform secondary surfacing welding on one side to ensure 5mm surfacing welding and 10mm surfacing welding on both sides. Slowly cool to room temperature after 2 hours, on both sides of the finish car gate, ensure that one side is 5°, and the angle between the two sides is 10°. The inspecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D9/00C21D6/00
CPCC21D1/18C21D6/002C21D9/0068
Inventor 张耀武杜文明李炜张小明
Owner SHANGHAI YUANGAO VALVE IND (GRP) CO LTD
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