Novel substitute material of seamless steel tubes for oil cylinders

A technology of seamless steel pipes and new materials, applied in the field of seamless steel pipes, can solve the problems of reducing fatigue life, shortening service life, reducing the strength of seamless steel pipes, etc., so as to reduce the tendency of weldable heat-sensitive cracks and improve safe service life. , The effect of prolonging the fatigue life

Inactive Publication Date: 2020-12-18
威海市宝隆石油专材有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nowadays, most of the seamless steel pipes for oil cylinders on the market are 27SiMn quenched and tempered seamless steel pipes, and their carbon content is 0.23%-0.32%. Sensitive cracks tend to appear in large numbers, which reduces the strength of seamless steel pipe after welding and shortens its service life. At the same time, the Si content is 1.10%-1.40%. When the Si content in the metal material is greater than or equal to 0.5%, its welding performance While deteriorating, the toughness and plasticity also decrease, and in bad weather, the stability of the seamless steel pipe is poor, and the fatigue life is greatly reduced

Method used

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  • Novel substitute material of seamless steel tubes for oil cylinders

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A new alternative material for seamless steel pipes for oil cylinders, the formula includes: C, Si, Mn, P, S, Al, Cr, Ni, Mo, Ti, V, Cu, Nb and Fe; the mass percentages of each component are respectively Yes: 0.15-0.19% C, 0.3-0.45% Si, 1.35-1.6% Mn, P≦0.025%, S≦0.015%, Cr≦0.25%, Ni≦0.25%, Mo≦0.1%, Ti≦0.1%, V≦0.1%, Cu≦0.2%, TAl≦0.025% and Nb≦0.1%, the rest is Fe, of which Si, Mn, Al, Cr, Ni, Mo, Ti, V, Cu and Nb all contain such metals Elements exist in the form of pig iron, and Fe is a high-quality scrap iron with less rust on the surface, no impurities, and a suitable size.

[0025] According to the above-mentioned technical scheme, a method for preparing a new substitute material for a seamless steel pipe for an oil tank comprises step 1, raw material selection; step 2, melting primary refining; step 3, LF refining; step 4, continuous casting of molten steel; step 5, Piercing hot rolling; Step 6, heat treatment;

[0026] Wherein in the above-mentioned step 1, high-...

Embodiment 2

[0033] A new alternative material for seamless steel pipes for oil cylinders, the formula includes: C, Si, Mn, P, S, Al, Cr, Ni, Mo, Ti, V, Cu, Nb and Fe; the mass percentages of each component are respectively Yes: 0.15-0.19% C, 0.3-0.45% Si, 1.35-1.6% Mn, P≦0.025%, S≦0.015%, Cr≦0.25%, Ni≦0.25%, Mo≦0.1%, Ti≦0.1%, V≦0.1%, Cu≦0.2%, TAl≦0.025% and Nb≦0.1%, the rest is Fe, of which Si, Mn, Al, Cr, Ni, Mo, Ti, V, Cu and Nb all contain such metals Elements exist in the form of pig iron, and Fe is a high-quality scrap iron with less rust on the surface, no impurities, and a suitable size.

[0034] According to the above-mentioned technical scheme, a method for preparing a new substitute material for a seamless steel pipe for an oil tank comprises step 1, raw material selection; step 2, melting primary refining; step 3, LF refining; step 4, continuous casting of molten steel; step 5, Piercing hot rolling; Step 6, heat treatment;

[0035] Wherein in the above-mentioned step 1, high-...

Embodiment 3

[0042] A new alternative material for seamless steel pipes for oil cylinders, the formula includes: C, Si, Mn, P, S, Al, Cr, Ni, Mo, Ti, V, Cu, Nb and Fe; the mass percentages of each component are respectively Yes: 0.15-0.19% C, 0.3-0.45% Si, 1.35-1.6% Mn, P≦0.025%, S≦0.015%, Cr≦0.25%, Ni≦0.25%, Mo≦0.1%, Ti≦0.1%, V≦0.1%, Cu≦0.2%, TAl≦0.025% and Nb≦0.1%, the rest is Fe, of which Si, Mn, Al, Cr, Ni, Mo, Ti, V, Cu and Nb all contain such metals Elements exist in the form of pig iron, and Fe is a high-quality scrap iron with less rust on the surface, no impurities, and a suitable size.

[0043] According to the above-mentioned technical scheme, a method for preparing a new substitute material for a seamless steel pipe for an oil tank comprises step 1, raw material selection; step 2, melting primary refining; step 3, LF refining; step 4, continuous casting of molten steel; step 5, Piercing hot rolling; Step 6, heat treatment;

[0044] Wherein in the above-mentioned step 1, high-...

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Abstract

The invention discloses a novel substitute material of seamless steel tubes for oil cylinders. The novel substitute material is prepared from the components in percentage by mass: 0.15-0.19% of C, 0.3-0.45% of Si, 1.35-1.6% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ni, less than or equal to 0.1% ofMo, less than or equal to 0.1% of Ti, less than or equal to 0.1% of V, less than or equal to 0.2% of Cu, less than or equal to 0.025% of Al, less than or equal to 0.1% of Nb and the balance of Fe. According to the novel substitute material, by properly reducing the contents of C and Si, the carbon equivalent in the seamless steel tube material for the oil cylinders is maintained between 0.40% and0.45%, the weldability and heat sensitivity crack tendency of the material is reduced to a great extent, the safe service life of an oil cylinder product is prolonged, by reducing the content of C and properly increasing the content of Mn, a guarantee is provided for the impact toughness of the material after heat treatment, by optimizing the heat treatment process, the hardness after heat treatment is ensured to be 235-255 HB, the impact toughness at -20 DEG C exceeds 70 J, the turning performance of an oil cylinder pipe is improved, and meanwhile, the fatigue life in a severe environment isprolonged.

Description

technical field [0001] The invention relates to the technical field of seamless steel pipes, in particular to a new substitute material for seamless steel pipes for oil cylinders. Background technique [0002] The seamless steel pipe is made by perforating the whole round steel. The steel pipe without weld seam on the surface is called seamless steel pipe. According to the production method, the seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, Cold-drawn seamless steel pipe, extruded seamless steel pipe, pipe jacking, etc., according to the cross-sectional shape, seamless steel pipe is divided into two types: round and special-shaped. Finned tubes are of various complex shapes, with a maximum diameter of 900mm and a minimum diameter of 4mm. According to different uses, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. Seamless steel pipes are mainly used for petroleum geological drilling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C22C38/22C22C38/24C22C38/28C22C38/20C22C38/42C22C38/44C22C38/46C22C38/50C22C38/38C22C38/58C21D8/10C21D1/18
CPCC21D1/18C21D8/105C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C22C38/20C22C38/22C22C38/24C22C38/28C22C38/38C22C38/42C22C38/44C22C38/46C22C38/50C22C38/58Y02P10/20
Inventor 张守奎张兴利孙晶李英辉王兰鹏
Owner 威海市宝隆石油专材有限公司
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