- EN 10305-1: Precision Hydraulic Steel Tube, Technical Delivery Conditions, Part 1: Cold Drawn Seamless Steel Tube

- EN 10305-2: Precision Hydraulic Steel Tube, Technical Delivery Conditions, Part 2: Cold Drawn Welded Steel Tube

- EN 10305-3: Precision Hydraulic Steel Tube, Technical Delivery Conditions, Part 3: Welded Steel Tube

- EN 10305-4: Precision Hydraulic Steel Tube, Technical Delivery Conditions, Part 4: Cold Drawn Seamless Steel Tube for Hydraulic and Pneumatic Systems

- EN 10305-5: Precision Hydraulic Steel Tube, Technical Delivery Conditions, Part 5: Welded Square and Rectangular Steel Tube

- EN 10305-6: Precision Hydraulic Steel Tube, Technical Delivery Conditions, Part 6: Cold Drawn Welded Steel Tube for Hydraulic and Pneumatic Systems

 

- GB/T 3639: Cold Drawn or Cold Rolled Precision Seamless Steel Tube

- GB 8713: Precision Inner Diameter Seamless Steel Tube for Hydraulic and Pneumatic Cylinder

- GB/T 14975: Stainless Steel Seamless Steel Tube for Structures

 

- ASTM A519: Seamless Carbon and Alloy Steel Mechanical Tubing

- ASTM A500: Structural Carbon Steel Cold-Formed Circular Section and Shape Welded and Seamless Steel Tubes

- AS 1450: Steel Tubes for Mechanical Purposes

- ASME B36.10M: Welded and Seamless Wrought Steel Pipe, Technical Delivery Conditions

- ASME B36.19M: Stainless Steel Pipe, Technical Delivery Conditions

- SAE J512: Automotive Tube Fittings

- SAE J525: Welded and Cold Drawn Low-Carbon Steel Tubing Annealed for Bending and Flaring

- SAE J526: Welded Low-Carbon Steel Tubing

- SAE J435: Automotive Steel Castings

- SAE J2467: Welded and Cold-Drawn, SAE 1021 Carbon Steel Tubing Normalized for Bending and Flaring

 

- BS 6323-1 to BS 6323-8: Seamless and Welded Steel Tubes for Automobile, Mechanical, and General Engineering Purposes

- IS 3074: Steel Tube for Automotive Purpose

 

- DIN 2391-1: Cold Rolled or Cold Drawn Precision Seamless Steel Tube, Dimensional Requirements

- DIN 2391-2: Cold Rolled or Cold Drawn Precision Seamless Steel Tube, Technical Delivery Conditions

- DIN 2393-1: Cold Rolled or Cold Drawn Precision Welded Steel Tube, Dimensional Requirements

- DIN 2393-2: Cold Rolled or Cold Drawn Precision Welded Steel Tube, Technical Delivery Conditions

 

- GOST 8733: Cold Rolled Cold Deformation and Hot Rolled Hot Deformation Seamless Steel Tube Technical Delivery Conditions

- GOST 8734: Cold Rolled or Cold Drawn Seamless Steel Tube Technical Delivery Conditions

 

- JIS G3441: Alloy Steel Tubes for Mechanical Structures, Technical Delivery Conditions

- JIS G3445: Carbon Steel Tubes for Mechanical Structures, Technical Delivery Conditions

- JIS G3446: Stainless Steel Tubes for Mechanical Structures, Technical Delivery Conditions

- JIS G3459: Stainless Steel Pipes, Technical Delivery Conditions

- JIS G3466: Carbon Steel Square Tubes for General Structure, Technical Delivery Conditions

- JIS G3472: Carbon Steel Tubes for Automobile Structural Purposes, Technical Delivery Conditions

- JIS G3473: Carbon Steel Tubes for Cylinder Barrels, Technical Delivery Conditions

- JIS G4903: Nickel-Chromium-Iron Alloy Seamless Pipes, Technical Delivery Conditions

 

- NF A49-541: Steel Tubes Cold Finished Welded Structural Hollow Sections

- NF A49-501: Steel Tubes Seamless or Welded Hot Finished Structural Hollow Sections

- NF A49-341: Steel Tubes Precision Welded Tubes for Mechanical Application

- NF A49-330: Steel Tubes Seamless Cold Drawn Tubes for Hydraulic and Pneumatic Power Systems

- NF A49-327: Steel Tubes Jack for Pneumatic Transmissions Cold Drawn Seamless Tubes Type Ready for Use

- NF A49-323: Steel Tubes Jacks for Hydraulic Transmissions Cold Rolled or Cold Drawn Seamless Tubes Type Ready for Use

 

10#, 20#, 35#, 45#, 40Cr, 25Mn, 37Mn5, St35(E235), St37.4, St45(E255), St52(E355), 30CrMo, 42CrMo, 4130, 4140...

 

NBK(+N), GBK(+A), BK(+C), BKW(+LC), BKS(+SR)

 

The Precision Bright Tube, after quenching to obtain a martensitic structure, is tempered in the temperature range of 450 to 600°C. Alternatively, it can be tempered at 650°C and then slowly cooled through the range of 350 to 600°C. Another option is to subject it to long-term heating in the range of 350 to 650°C after tempering at 650°C. All these processes can induce embrittlement in the Precision Bright Tube. If a previously embrittled 20# Precision Hydraulic Steel Tube is reheated to 650°C and then rapidly cooled, its toughness can be restored, hence the term "reversible temper embrittlement." High-temperature temper embrittlement is manifested by an increase in the transition temperature between toughness and brittleness for the Precision Bright Tube. The severity of high-temperature temper embrittlement is generally expressed by the difference in the transition temperature (ΔT) between the toughened and embrittled states. The more severe the high-temperature temper embrittlement, the higher the proportion of intergranular fracture on the fracture surface of the Precision Bright Tube.