Alloy steel

SA210C A53 A106GR.B A106C A178 seamless steel pipe

A106 seamless steel pipe is a seamless steel pipe used to transport high-temperature fluids such as water, oil, and gas.
American Standard ASTM A106-ASME SA106 is used to transport high temperature fluids such as water, oil and gas. A106A, A106B, A106C A106gr.b
High-pressure seamless steel pipes and high-pressure boiler pipes are a type of boiler pipe and belong to the category of seamless steel pipes. The manufacturing method is the same as that of seamless pipes, but there are strict requirements on the steel grades used in the manufacture of steel pipes. High-pressure boiler tubes are often in high-temperature and high-pressure conditions when they are used. High-pressure boiler tubes are mainly used to make superheater tubes, reheater tubes, air ducts, main steam tubes, etc. for high-pressure and ultra-high-pressure boilers. The requirements for installation of high-pressure pipelines are similar to those for installation of medium and low-pressure pipelines, but the requirements are higher and the regulations are stricter. Therefore, in addition to meeting the requirements for installation of medium and low-pressure pipelines, the following requirements should be implemented.
High-pressure seamless steel pipe is a kind of seamless pipe. The manufacturing method is the same as that of seamless pipes, but there are strict requirements on the steel grades used in the manufacture of steel pipes. According to the operating temperature, it can be divided into general boiler tubes and high-pressure boiler tubes.
① The service temperature of high-pressure seamless steel pipes is below 450℃. Domestic pipes are mainly made of No. 10 and No. 20 carbon steel hot-rolled pipes or cold-drawn pipes.
② High-pressure seamless steel pipes are often used in high temperature and high pressure conditions, and the pipes will be oxidized and corroded under the action of high-temperature flue gas and water vapor. The steel pipe is required to have high durable strength, high oxidation and corrosion resistance, and good organizational stability.
The high-pressure pipe sections, pipe fittings, fasteners and valves used for installation must be inspected and qualified with corresponding technical certification documents. After being shipped to the site, they should be properly kept, marked clearly, and placed neatly. Before installation, the inner and outer surfaces should be wiped clean, and at the same time, check whether there is any foreign matter in the inner passage and whether it is unblocked. Check whether the roughness of the sealing surface of the nozzle and the gasket meets the requirements. There should be no scratches (especially radial scratches), spots and other defects that affect the sealing performance on the sealing surface. The sealing surface of the mouth and the gasket are coated with engine oil or butter or white petroleum jelly for protection. The threaded part of the pipe end of the high-pressure pipe that has passed the inspection shall be protected by a blend of molybdenum disulfide grease or graphite oil, except for the specified degreasing pipe.
When the pipeline is installed, it should be fixed with a formal pipe rack, and the pipe rack in contact with high-pressure pipes and pipe fittings should be installed with protective sleeves according to the design requirements. When installing the high-pressure flange, the chamfer of the pipe end thread should be exposed. When installing the gasket, do not hang it with metal wire. Grease the nozzle and gasket beforehand. The soft metal high-pressure gasket should be accurately placed in the sealing seat. Flange bolts should be tightened symmetrically and evenly, without excessive. After the bolts are tightened, the two flanges should be parallel and concentric. The exposed length is basically the same. During the installation process, do not use methods such as strong pulling, pushing, twisting or modifying the thickness of the gasket to make up for manufacturing or installation errors. If the pipeline installation work cannot be carried out and completed continuously, the open nozzles should be closed in time. The parts of the instrument sampling location on the pipeline should be installed at the same time as the pipeline.

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A335 P11 A213 T11 A369FP12 A199 T11 high pressure alloy steel pipe

The application field of a335-p11 alloy pipe is expanded to provide broader space for the development of the industry.

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Spot warranty sales of 42CrMo4 alloy steel pipe manufacturers

42crmo4 is an industrial material. 42CrMo4 is used to manufacture forgings that require higher strength than 35CrMo steel and a larger quenched and tempered section, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods and spring clips that are heavily loaded. 42CrMo4 is also It can be used for oil deep well drill pipe joints and fishing tools under 2000m.
1. Hot rolling (extruded seamless steel pipe): round tube billet→heating→perforation→three-roll cross rolling, continuous rolling or extrusion→tube removal→sizing (or reducing)→cooling→straightening→hydraulic test (Or flaw detection)→mark→warehousing
2. Cold drawn (rolled) seamless steel pipe: round tube blank → heating → piercing → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → billet tube → heat treatment → straightening →Hydraulic test (flaw detection)→Marking→Warehousing
Carbon C: 0.38～0.45
Silicon Si: 0.17～0.37
Manganese Mn: 0.50～0.80
Sulfur S: allowable residual content ≤0.035
Phosphorus P: allowable residual content ≤0.035
Chromium Cr: 0.90～1.20
Nickel Ni: allowable residual content ≤0.030
Copper Cu: allowable residual content ≤0.030
Molybdenum Mo: 0.15～0.25
42CrMo heat treatment:
Annealing No.1 “760±10℃ annealing, furnace cooling to 400℃ air cooling.
HB220-230
Normalize No.4 860±10℃ normalize, air-cooled out of the furnace.
Thermal processing specifications
The heating temperature is 1150 ~1200°C, the starting temperature is 1130 ~1180°C, and the ending temperature is> 850°C, when φ> 50mm, slow cooling.
Normalizing norms
The normalizing temperature is 850~900°C, and the furnace is air-cooled.
High temperature tempering specification
The tempering temperature is 680~700°C, and the furnace is air-cooled.
Quenching and tempering specifications
Preheating temperature is 680~700°C, quenching temperature is 840~880°C, oil cooling, tempering temperature is 580°C, water cooling or oil cooling, hardness ≤217HBW.
Specification for sub-temperature quenching
Quenching temperature 900°C, tempering temperature 560°C, hardness (37±1) HRC
Specification for induction hardening and tempering
The quenching temperature is 900°C, the tempering temperature is 150~180°C, and the hardness is 54~60HRC.

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A53 high pressure seamless steel pipe manufacturer

A53 seamless steel pipe is a material of American standard steel pipe, in which a53-a is equivalent to domestic 10# steel, a53-b is equivalent to domestic 20# steel, and a53-f is equivalent to domestic Q235 material.

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