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Low-temperature carbon steel valve casting material and manufacturing method thereof

A low-temperature steel and casting technology, applied in the field of low-temperature carbon steel valve casting materials, can solve the problems of time-consuming and laborious, the key process of heat treatment has not been studied in detail, and the valve is not suitable for use.

Active Publication Date: 2020-10-30
南平市建阳区湛卢精密制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the application ensures that the cast structure has good mechanical properties by adjusting the chemical composition and controlling the heat treatment temperature, the alloy material is mainly used in ultra-low temperature environments, and is not suitable for valves used in medium and low temperature environments
[0011] CN105385802A discloses a casting process for a low-temperature high-toughness nodular cast iron butterfly valve body, which includes the following steps: 1) smelting process: 1. material preparation; 2. smelting; 2) spheroidizing and inoculating process; ) heat treatment process; this process changes the traditional melting process by adding silicon carbide through a strict ratio of raw materials, and uses a dam-type spheroidizing bag combined with a compacted inoculant to protect the spheroidizing agent, making the mechanical properties outstanding; but the patent mainly It lies in the improvement of the smelting process, and there is no detailed research on the material itself and the key process of heat treatment
[0013] At present, based on the development of new materials for low-temperature valve castings based on carbon steel, for the specific medium and low temperature environment used (-30°C to -60°C, especially the extreme range of -46°C to -60°C), try to find a suitable carbon steel The combined use of metal elements and non-metal elements for modification is not only difficult to study, but also time-consuming and laborious, so there are few studies

Method used

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  • Low-temperature carbon steel valve casting material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0091] Preparation of Alloyed Composite Carbon Steel Material 1

[0092] (1) Preparation of raw materials:

[0093] S1-1: Prepare a commercially available composite steel composed of LCB steel and LCC steel with a mass ratio of 8:2 as the source of the ferritic low-temperature steel matrix material. The surface is cleaned in advance to remove impurities and the surface oxide layer is polished. After cleaning and drying, the obtained The dry steel body material is about 0.5 tons; wherein, the composition of the LCB steel is: C content is 0.18-0.19%, Si content is 0.4-0.5%, Mn content is 0.8-1.0%, S is about 0.04%, P≤ 0.03%, Ni≤0.30%, Cr≤0.20%, Mo≤0.20%, Cu≤0.20%, V≤0.030% (the total amount of Ni, Cr, Mo, Cu, V is less than 1%), the rest is Fe and unavoidable of impurities. Wherein, the composition of the LCC crude steel is: C content 0.15-0.16%, Si content 0.45-0.5%, Mn content 1.0%, S about 0.04%, P≤0.03%, Ni≤0.250%, Cr≤ 0.20%, Mo≤0.20%, Cu≤0.20%, V≤0.030% (the total amount...

preparation example 2

[0102] Preparation of Alloyed Composite Carbon Steel Material 2

[0103] (1) Preparation of raw materials:

[0104] S1-1: Prepare a commercially available composite steel composed of LCB crude steel and LCC crude steel with a mass ratio of 6:4 as the source of the ferritic low-temperature steel matrix material. The surface is cleaned in advance to remove impurities and the surface oxide layer is polished, and then cleaned and dried. After obtaining about 0.5 tons of dried steel material; wherein, the composition of the LCB steel is: C content is 0.18-0.19%, Si content is 0.4-0.6%, Mn content is 0.8-1.0%, S≤0.03%, P ≤0.03%, Ni≤0.20%, Cr≤0.20%, Mo≤0.20%, Cu≤0.20%, V≤0.02% (the total amount of Ni, Cr, Mo, Cu, V is less than 1%), the rest is Fe and not Avoid impurities. Wherein, the composition of the LCC crude steel is: C content 0.14-0.15%, Si content 0.5-0.6%, Mn content 1.2%, S≤0.03%, P≤0.03%, Ni≤0.20%, Cr≤0.20 %, Mo≤0.20%, Cu≤0.20%, V≤0.030% (the total amount of Ni, Cr, Mo...

Embodiment 1

[0111] A method for preparing cryogenic valve castings, comprising the steps of:

[0112] (1) Casting pouring:

[0113] Adjust the temperature of the alloy liquid in Preparation Example 1 to 1620-1680°C until it is stable and release it from the furnace; after sedation treatment, pour the alloy liquid into a mold to obtain a valve casting at a pouring temperature of 1550-1600°C.

[0114]The casting pouring in this step can adopt conventional pouring means in this field according to the actual situation. When pouring, use hardened water glass sand to cast the mold, and the furnace lining is neutral; if the slagging and deoxidation treatment is not performed in the previous step, the pouring system with slag skimming and turbulent flow can also be used to pour alloy steel in this step. The steel temperature is 1620-1680°C, and it is deoxidized. After the deoxidation is completed, appropriate boron iron can be added to improve the fluidity. Combined with the actual production t...

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Abstract

The invention discloses a low-temperature carbon steel valve casting material and a preparation method thereof as well as a method of using the material to prepare a low-temperature valve casting. A composite carbon steel material is prepared from ferrite low-temperature steel base materials and alloy additive materials; and the alloy additive materials comprise at least one of sub-alloy materialsincluding a niobium-manganese-iron alloy and a rare earth-iron alloy. Furthermore, in combination of a specific hot treatment method, the problem that the valve casting is relatively low in low-temperature impact toughness value under a medium to low temperature, particularly an extremely low temperature is solved.

Description

technical field [0001] The invention relates to a low-temperature carbon steel valve casting material, in particular to an alloyed carbon steel valve casting material used in a medium-low temperature environment and a manufacturing method thereof. Background technique [0002] In recent years, the mechanical manufacturing industry, especially the petrochemical industry, has more and more demands for cryogenic valves, and it is becoming more and more stringent. At present, the domestic temperature demand for cryogenic valves mainly exists in the two ranges of low temperature (0 to -60°C) and ultra-low temperature (less than -100°C). Generally speaking, most of the valve materials used under ultra-low temperature conditions are stainless steel forgings, and alloy steel with high nickel and high chromium is commonly used as the valve body casting material. Although high-nickel-chromium alloy steel has a significant effect on low-temperature resistance, due to the high cost of ...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C35/00C21D1/18C21D9/00
CPCC21D1/18C21D9/0068C22C33/006C22C33/06C22C35/005
Inventor 余文龙叶章明叶建华叶华周范军张秋华陈维勇陈景辉
Owner 南平市建阳区湛卢精密制造有限公司
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