E255 Cylinder Seamless Precision Steel Tube For Machine Structural

EN10305-1 E235/E255/E355 + NBK/N/BK Gas Spring Precision Seamless Steel Tube

Precision Cylinder Tubes, Honed Tubes

Seamless cold drawn precision tubes and pipes are widely used for machine structural purposes, automobile, and hydraulic pressure equipment.

Size: Outside Diameter: 6mm – 340mm, Wall Thickness: 1mm – 50mm

Standard: DIN2391, DIN2394, ASTM A519, JIS G3445 STKM

Application: used for Air Cylinder and Oil Cylinder, Oil Inlet Tubes and Gas Spring Tubes on Automobile, Bushing Tubes.

Quality Control:
1. Incoming Raw Material Inspection
2. Raw Material Segregation to avoid steel grade mix-up
3. Heating and Hammering End for Cold Drawing
4. Cold Drawing or Cold Rolling, Online inspection
5. Heat Treatment:+SR, +A, +N
6. Straightening/Cutting to specified length/Finished Measuring Inspection
7. Quality Testing in own lab with Tensile Strength, Yield Strength, Elongation, Hardness, Straightness, etc.
8. Packing and Stocking.

100% Eddy Current Testing.
100% Size Tolerance Checking.
100% Tube surface checking to avoid surface defects.

• High dimensional accuracy for inside and outside diameters

• Extremely limited wall thickness tolerances
• Reduced eccentricity
• Smooth drawn surface
• Increased strength values due to cold forming
• Tightly staggering range of dimensions
• Customized heat treatment

Changzhou Joyruns Steel Tube Co., Ltd specializes in the export of steel pipes for 20 years. We have been a leading supplier of high-quality steel pipes of carbon, alloy, nickel material & copper, which is one of the most professional Bundy and stainless steel pipe manufacturers in China.

Changzhou Joyruns steel tube Co., Ltd has advanced technology, equipment, management and a good reputation, ensures that high-quality products and services are provided, the customer is satisfied. The company has implemented an effective quality assurance system, and long-term planning, maintenance, control and improvement of the quality of the products. 

We uphold the "JOYUNS" brand "win-win cooperation and practical innovation"

The product categories are as follows:

Bundy tube: Single-wall copper tube, Single-wall galvanized tube, Double-wall copper pipe, Double-wall zinc-coated Bundy tube, Aluminum tube, Copper tube

Carbon steel pipe: A179 heat-exchanger tube, Boiler tube, Alloy tube, Automobile precision pipe

Stainless steel pipe: Austenitic stainless steel pipe, Duplex/Super Duplex stainless steel pipe, Nickel alloy steel pipe, Titanium steel pipe.

All staff sincerely thank you for your concern and use of our products, and sincerely welcome your valuable comments on our products and services.