Preparation method of Y-shaped hot-pressed three-way pipe fitting

Abstract

The invention relates to a method for producing Y-shape thermal compress three-way, belonging to the metallic tube processing technique. Said method is formed by blank selecting, thermal compressing, bending and machining, etc. wherein, the thermal compressing step comprises: first heating and compressing the blank into T-shape three-way blank; the bending step comprises: heating and bending the main tube of said T-shape blank to form the Y-shape three-way blank. The invention can be used to product the metallic tube Y-shape three-way whose Dn is 100-1000mm and diameter / thickness is less than 14 / . The invention has lower cost, simple process, easy operation and it can use standard three-way and short-radius bent moulds. The invention can reach relative standards as size, allowance, detection and physicochemical test.

Description

technical field

[0001] The invention relates to a method for preparing a pipe fitting, in particular to a method for preparing a seamless Y-shaped tee for conveying pressure liquid or gas, and belongs to the technical field of metal pipe fitting processing. Background technique

[0002] The seamless tee is an important pipe fitting for pipeline engineering applications in petroleum, chemical, electric power, metallurgy and other industries. It is usually used to transport pressure liquid or gas such as oil, natural gas, gas, water and certain solid materials. As a pipe for transmitting the above-mentioned media, the seamless tee usually has a high working temperature and must bear a certain pressure, so the requirements for its mechanical and physical and chemical properties are relatively high. The manufacturing process of the seamless tee can be realized by cold extrusion for small-diameter pipes, and the large-diameter tee can be completed by forging machining or hot extr...

Examples

Embodiment 1

[0025] a. Billet selection: seamless steel pipe material: No. 20 steel; specification: Dn100mm, wall thickness is 10mm;

[0026] b. Hot pressing: heat the billet to 980-1050°C, and press it into a T-shaped tee-shaped billet in a T-shaped tee mold;

[0027] c. Curved shape: heat the hot-pressed T-shaped tee-shaped blank to 950-1050°C, and bend the main pipe on the short-radius elbow mold to make a 90°Y-shaped tee-shaped blank;

[0028] d. Machining: remove the margin at each end of the Y-shaped tee shape blank, and perform groove machining on the port.

Embodiment 2

[0030] a. Billet selection: seamless steel pipe material: 12Cr1MoV steel; specification: Dn1000mm, wall thickness 80mm

[0031] b. Hot pressing: heat the billet to 1000-1100°C, and press it into a T-shaped tee-shaped billet on a T-shaped tee mold;

[0032] c. Curved shape: reheat the hot-pressed T-shaped tee-shaped blank to 1000-1100°C, bend the main pipe on the short-radius elbow mold, and make it into a Y-shaped tee-shaped blank;

[0033] d. Machining: remove the margin at each end of the Y-shaped tee shape blank, and perform groove machining on the port.

Embodiment 3

[0035] a. Billet selection: seamless steel pipe material: 0Cr18Ni9 steel; specification: Dn300mm, wall thickness 30mm;

[0036] b. Hot pressing: heat the billet to 1000-1200°C, and press it into a T-shaped tee-shaped billet in a T-shaped tee mold;

[0037] c. Curved shape: reheat the hot-pressed T-shaped tee-shaped blank to 1100-1200°C, bend the main pipe on a short-radius elbow mold, and make it into a Y-shaped tee-shaped blank;

[0038] d. Machining: remove the margin at each end of the Y-shaped tee shape blank, and perform groove machining on the port.

[0039] The finished Y-shaped tee still needs to undergo various corresponding tests on mechanical properties and metallurgy.

technical field

[0001] The invention relates to a method for preparing a pipe fitting, in particular to a method for preparing a seamless Y-shaped tee for conveying pressure liquid or gas, and belongs to the technical field of metal pipe fitting processing. Background technique

[0002] The seamless tee is an important pipe fitting for pipeline engineering applications in petroleum, chemical, electric power, metallurgy and other industries. It is usually used to transport pressure liquid or gas such as oil, natural gas, gas, water and certain solid materials. As a pipe for transmitting the above-mentioned media, the seamless tee usually has a high working temperature and must bear a certain pressure, so the requirements for its mechanical and physical and chemical properties are relatively high. The manufacturing process of the seamless tee can be realized by cold extrusion for small-diameter pipes, and the large-diameter tee can be completed by forging machining or hot extr...

Examples

Embodiment 1

[0025] a. Billet selection: seamless steel pipe material: No. 20 steel; specification: Dn100mm, wall thickness is 10mm;

[0026] b. Hot pressing: heat the billet to 980-1050°C, and press it into a T-shaped tee-shaped billet in a T-shaped tee mold;

[0027] c. Curved shape: heat the hot-pressed T-shaped tee-shaped blank to 950-1050°C, and bend the main pipe on the short-radius elbow mold to make a 90°Y-shaped tee-shaped blank;

[0028] d. Machining: remove the margin at each end of the Y-shaped tee shape blank, and perform groove machining on the port.

Embodiment 2

[0030] a. Billet selection: seamless steel pipe material: 12Cr1MoV steel; specification: Dn1000mm, wall thickness 80mm

[0031] b. Hot pressing: heat the billet to 1000-1100°C, and press it into a T-shaped tee-shaped billet on a T-shaped tee mold;

[0032] c. Curved shape: reheat the hot-pressed T-shaped tee-shaped blank to 1000-1100°C, bend the main pipe on the short-radius elbow mold, and make it into a Y-shaped tee-shaped blank;

[0033] d. Machining: remove the margin at each end of the Y-shaped tee shape blank, and perform groove machining on the port.

Embodiment 3

[0035] a. Billet selection: seamless steel pipe material: 0Cr18Ni9 steel; specification: Dn300mm, wall thickness 30mm;

[0036] b. Hot pressing: heat the billet to 1000-1200°C, and press it into a T-shaped tee-shaped billet in a T-shaped tee mold;

[0037] c. Curved shape: reheat the hot-pressed T-shaped tee-shaped blank to 1100-1200°C, bend the main pipe on a short-radius elbow mold, and make it into a Y-shaped tee-shaped blank;

[0038] d. Machining: remove the margin at each end of the Y-shaped tee shape blank, and perform groove machining on the port.

[0039] The finished Y-shaped tee still needs to undergo various corresponding tests on mechanical properties and metallurgy.

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