20CrMo seamless pipe is a common alloy seamless pipe, 20CrMo seamless pipe has high hardenability, no temper brittleness, good weldability, little tendency to form cold cracks, good machinability and cold strain plasticity . It is generally used in the quenched and tempered or carburized and quenched state. It is used to manufacture high-pressure pipes and various fasteners that work in non-corrosive media and media with a working temperature lower than 250 ° C and containing nitrogen-hydrogen mixtures, and higher-level carburizing. Components such as gears, shafts, etc.
2. The national standard is GB/T 3077-2015, which is equivalent to foreign standards and grades are JIS G4053-2008: SCM 420, ASTM A29M-2012: 4120
3. The delivery state of 20CrMo seamless pipe: it is delivered in the state of heat treatment (normalizing, annealing or high temperature tempering) or without heat treatment, and the delivery state should be indicated in the contract.
4. Heat treatment of 20CrMo seamless pipe: 20CrMo seamless pipe belongs to low-carbon alloy structural steel, suitable for carburizing and quenching treatment; heat treatment specification: quenching 880 ºC, water cooling, oil cooling; tempering 500 ºC, water cooling, oil cooling
5.20CrMo seamless pipe chemical composition:
Carbon C: 0.17~0.24
Silicon Si: 0.17~0.37
Manganese Mn: 0.40~0.70
Sulfur S: Allowable residual content ≤0.035
Phosphorus P: allowable residual content ≤0.035
Chromium Cr: 0.80~1.10
Molybdenum Mo: 0.15~0.25
Nickel Ni: allowable residual content ≤0.03
Copper Cu: allowable residual content ≤0.03
6. Mechanical properties of 20CrMo seamless pipe: The biggest feature of 20CrMo seamless pipe is high strength and good welding performance. Although the general high-strength steel yields to a certain strength, it loses its hardenability, and its welding performance cannot be compared with the American standard ASTM A514 steel pipe. 20CrMo seamless pipe has high strength, even at extremely low temperature, it can still maintain the mechanical properties of the steel plate itself. Good fatigue resistance; high toughness and low brittle transition temperature; good cold forming performance and welding performance; good corrosion resistance and certain wear resistance.
Tensile strength σb (MPa): ≥885(90)
Yield strength σs (MPa): ≥685(70)
Elongation δ5 (%): ≥12
Reduction of area ψ (%): ≥50
Impact energy Akv (J): ≥78
Impact toughness value αkv (J/cm2): ≥98(10)
Hardness: ≤197HB
7. Application of 20CrMo seamless pipe
It is used to manufacture high-pressure pipes, various fasteners, and higher-grade carburized parts, such as gears and shafts, that work in non-corrosive media and media with a working temperature below 250 ° C and containing nitrogen-hydrogen mixtures.

Zhengde hot-rolled seamless steel pipe is a long strip of steel with a hollow section and no joints around it. The steel pipe has a hollow cross-section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, seamless steel pipe is lighter in weight when the bending and torsional strength is the same. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes and automobile transmission shafts. , bicycle racks and steel scaffolding used in building construction, etc. The use of seamless steel pipes to manufacture ring parts can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing hours, such as rolling bearing rings, jack sets, etc., which have been widely used in steel pipes. Hot-rolled seamless steel pipe is also an indispensable material for various conventional weapons. Gun barrels, barrels, etc. must be made of steel pipes.

Three-roll pipe mill
The seamless steel pipe produced by the three-roll mill for hot-rolling seamless steel pipe has high precision. Because of the cross-rolling with the mandrel, the rolling action is repeated many times in one pass, which greatly improves the accuracy of the wall thickness and is not easy to produce. Defects such as scratches, ears, and green lines; the flexibility in production is large, and the pass size can be changed with the help of the clutch of the roll.

Adequate inventory
Standing inventory of carbon seamless tubes, seamless special-shaped tubes, alloy seamless tubes, precision tubes. Various types of seamless steel pipes with a specification of 5-426*0.5-60mm and a length of 2-16m. The cold-rolled precision bright tubes produced by our factory have smooth appearance, uniform wall thickness, no oxide layer, and high precision. The inner hole of the steel pipe can be divided into round type, spline type, plum blossom type, etc. It is widely used in automobiles, motorcycles, electric power, petrochemicals, ships, aerospace, bearings, pneumatic components, oil cylinders, boiler equipment, medical equipment, fitness equipment and other industries.

Attention to detail
No matter how to choose the hot-rolled seamless steel pipe, its quality cannot be ignored. It must be noted that there should be no defects on the surface, such as small cracks or scars, etc., and that the thickness of the pipe wall is the same to ensure uniformity. The physical comparison is still very important. Only after the basic comparison of the physical objects is done, can the steel pipes that meet the needs be selected. The processing technology of each seamless steel pipe is different, which will also affect its application field. Now it is generally processed by cold drawing and hot rolling, and the processing effect of the two and the application of steel pipes will also have certain differences.

Applicable scene
Hot-rolled seamless pipes specifically include low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, seamless steel pipes for ships, petroleum cracking steel pipes, seamless steel pipes for high-pressure fertilizer equipment, oil jacket steel pipes, pipeline steel pipes, hollow sucker rods, and ordinary fluid steel pipes. , structural seamless steel pipes and imported alloy steel pipes, etc., with rich varieties and complete specifications, widely used in petroleum, chemical, electric power, boilers, ships, machinery and other industries, and have been sold all over the world.

Quality first: production and inspection in strict accordance with production standards;
Price advantage: discounts based on real market prices;
Transaction security: There will be no loss of customer funds;
After-sales guarantee: the customer's problem is our problem;
Long-term cooperation: quality assurance, price advantage, sincere service can last for a long time.

Shandong Zhengde Metal Manufacturing Co., Ltd. is a production and sales company integrating hot-rolled steel coils, cold-rolled steel coils, galvanized steel coils, color-coated steel coils, section steel, steel pipes, steel wires, metal mesh, stainless steel, aluminum, copper and other metal products integrated large enterprises. Five production and sales bases have been formed in Binzhou, Liaocheng, Wuxi, Tianjin, Jinan and Tai'an, with more than 100 production lines, 4 nationally recognized laboratories, 2 technical engineering centers, and 5 enterprise technology centers. Products are exported to more than 50 countries and regions such as North America, South America, Europe, Africa, Oceania, Middle East, and Southeast Asia.