SAE1020 /St37.4/ St52 High-Precision Cold-Rolled Steel Pipe

Precision steel pipe is a kind of high-precision steel pipe material after cold drawing or hot rolling. Precise steel pipes are mainly used to produce products of pneumatic or hydraulic components, such as cylinders or oil cylinders, due to their advantages such as no oxide layer on the inner and outer walls, no leakage under high pressure, high precision, high finish, no deformation during cold bending, flaring, flattening and no cracks The precision steel pipe has high dimension accuracy, high internal and external surface finish, no oxide film on the internal and external surfaces of the steel pipe after heat treatment, no crack on the expanded and flattened steel pipe, no deformation during cold bending, and can withstand high pressure, and can be used for various complex deformation and deep mechanical processing. Haihui steel pipe is specialized in custom production of high quality seamless steel tubes under international standards ASTM A519, ASTM A106, ASTM A500, ASME SA500, DIN2391, DIN1629, EN10305-1, DIN17121, EN10297-1, JIS3441, JIS3444 and JIS3445. We provide small batch customization service, especially for small and medium-size enterprises. Raw material, internal and external dimensional tolerances and consistency, internal and external surface roughness, straightness, mechanical properties, eccentricity, special shape, alloy steel, small-diameter thick-walled seamless steel tubes all can be customized. The production range for outer diameter is from 10 to 120mm and for wall thickness is from 1 to 20mm.

Products Details

Characteristics of Precision Steel Pipe

1. The dimension accuracy of finished pipe is high, and the internal and external diameter can be accurate to within 0.05mm; 2. Good surface quality; Good internal and external surface finish; 3. The cross section is more complex; The inner and outer surfaces of the cold rolled steel tubes are free of oxide film; 4. Capable of withstanding greater pressure; The steel pipe shall be flaring and flattening without crack, cold bending without deformation, and can withstand medium and high pressure; 5. Better performance and denser metal.

Chemical Composition

Steel Grade Chemical Composition  %
  C(%) Si(%) Mn(%) S(%) P(%) Cr(%)
10# 0.07-0.13 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035  
20# 0.17-0.23 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035  
35# 0.32-0.39 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035  
45# 0.42-0.50 0.17-0.37 0.50-0.80 ≤0.035 ≤0.035  
40Cr 0.37-0.44 0.17-0.37 0.50-0.80 ≤0.035 ≤0.035 0.08-1.10
25Mn 0.22-0.29 0.17-0.37 0.70-1.00 ≤0.035 ≤0.035 ≤0.25
37Mn5 0.30-0.39 0.15-0.30 1.20-1.50 ≤0.015 ≤0.020  

Why Choose Haihui Steel?

(1) Large Scale Production,Strong R&D Capability The annual production capacity can reach 30,000 tons under years of development. Every-year R&D investment and a team of technicians enable Tenjan with strong R&D capability. Haihui Steel has full system of production with advanced equipment, such as perforation, pickling, cold rolling, cold drawing, straightening, flaw detection, tensile test and machining. (2) Quality Control Every batch of products can be traced and guaranteed by the raw material certificate and steel tube quality certificate. Complete quality control system, following ISO9001, to ensure a full inspection process such as pull force test, chemical composition test and eddy current detection. (3) Major Customer Case We have long-term relationship with customers such as Midea, Sinohydro, China Pingmei, China Academy of Building Research and so on.  (4) Export Countries Our products were exported to Europe, America, Japan, South Korea, The Middle East, Southeast Asia and in total six continents over 20 countries, and which has been consistently trusted by customers. (5) Customer Service Haihui Steel provides considerate service to every customer with fast feedback, quality track and technical support.  


+C(BK) Cold drawn/hard.After the last cold forming,no heat treatment.
+LC(BKW) Cold drawn/soft.After the last heat treatment follows the cold drawing there is a light finishing pass.
+SR(BKS) Cold drawn and stress relieved annealed. After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere.
+A(GBK) After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere.
+N(NBK) Normalized. After the last cold drawing process the tubes are annealed in a controlled atmosphere.

Preicision Seamless Tube Size List

OD (mm) Thickness (mm) OD (mm) Thickness (mm) OD (mm) Thickness (mm) OD (mm) Thickness (mm)
Φ13.1 1.5-3 Φ35.5 1.5-7 Φ46.1 1.5-10 Φ93 1.5-15
Φ19.25 1.5-5 Φ35.9 1.5-7 Φ47.8 1.5-10 Φ19-Φ121 1.5-15
Φ22 1.5-5 Φ36.6 1.5-7 Φ49.2 1.5-10    
Φ22.2 1.5-5 Φ38 1.5-8 Φ49.5 1.5-10    
Φ25 1.5-6 Φ38.4 1.5-8 Φ52.3 1.5-10    
Φ26.3 1.5-6 Φ40 1.5-10 Φ53.8 1.5-10    
Φ27 1.5-6 Φ40.2 1.5-10 Φ57 1.5-10    
Φ28 1.5-6 Φ40.9 1.5-10 Φ59 1.5-10    
Φ30 1.5-6 Φ41.3 1.5-10 Φ60 1.5-11    
Φ30.25 1.5-6 Φ41.6 1.5-10 Φ62.5 1.5-11    
Φ30.9 1.5-6 Φ42 1.5-10 Φ74 1.5-11    
Φ31 1.5-7 Φ43 1.5-10 Φ75 1.5-11    
Φ32 1.5-7 Φ44.5 1.5-10 Φ76 1.5-11    
Φ35 1.5-7 Φ45.8 1.5-10 Φ89 1.5-15    
Application of Precision Steel Pipe Precision steel tubes are widely used, and many parts are made of precision steel tubes. Almost every industry needs to use it. Such as automobiles, motorcycles, electric vehicles, petrochemical, electric power, ships, aerospace, bearings, pneumatic components, medium and low pressure boiler seamless steel tubes, etc., can also be applied to steel sleeve, bearings, hydraulic, mechanical processing and other fields!

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