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Help CenterSteel Pipe & Tube & Precision Steel Pipe，GB/T 3639-2021、GB/T 17395-2024、- DIN 2391-2、ASTM A519、ASTM A106
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Steel Pipe & Tube & Precision Steel Pipe，GB/T 3639-2021、GB/T 17395-2024、- DIN 2391-2、ASTM A519、ASTM A106NegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & High Pressure Boiler Tube，ASME SA-213、SA-335、SA-106、EN 10216-2、DIN 17175NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & High Pressure Boiler Tube，ASME SA-213、SA-335、SA-106、EN 10216-2、DIN 17175NegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & High Pressure Boiler Tube，ASME SA-213、SA-335、SA-106、EN 10216-2、DIN 17175NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & High Pressure Boiler Tube，ASME SA-213、SA-335、SA-106、EN 10216-2、DIN 17175NegotiableMOQ: 5 Metric Tons
Precision Steel Pipe Product Specification
1. Product Definition
Precision steel pipes are high-precision seamless steel pipes manufactured through cold drawing and cold rolling processes. They eliminate the defects of ordinary steel pipes such as large dimensional deviation, rough inner walls and oxide layers. Featuring accurate dimensions, smooth surface, stable mechanical properties and excellent pressure tightness, the pipes can be directly used for precision assembly, high-pressure hydraulic systems, mechanical transmission and other core working conditions without secondary finishing, greatly reducing processing costs and working hours.
2. Executive Standards
Chinese National Standards: GB/T 3639-2021 Cold-drawn/Cold-rolled Precision Seamless Steel Pipes, GB/T 17395-2024 Dimensions, Shapes, Weights and Allowable Deviations of Seamless Steel Pipes
European Standard: DIN 2391-2
American Standard: ASTM A519, ASTM A106
3. Core Materials, Models and Detailed Specifications
We only produce carbon steel and alloy steel precision steel pipes without stainless steel materials. Each material model adapts to different industrial scenarios with accurate and controllable specification parameters, and customized fixed-length and fixed-diameter production is available.
3.1 Common Material Models and Performance Characteristics
3.1.1 Carbon Steel Series (Universal Grade)
20# Precision Steel Pipe: A high-quality low-carbon structural carbon steel with excellent plasticity, toughness and weldability without hardening tendency. It features uniform mechanical properties and high surface finish. It is a universal main material for hydraulic pipelines, oil cylinders, air cylinders and general mechanical structures, suitable for most normal-temperature and medium-low pressure working conditions.
45# Precision Steel Pipe: A high-quality medium-carbon structural carbon steel with much higher strength and hardness than 20# steel, as well as excellent wear resistance and deformation resistance. It can be strengthened through heat treatment such as quenching and tempering. It is widely used for manufacturing precision shaft parts, gear bushes, machine tool accessories and high-strength mechanical structural parts.
3.1.2 Alloy Steel Series (High-strength, Wear-resistant and Pressure-resistant Grade)
16Mn (Q345B) Precision Steel Pipe: A low-alloy high-strength steel with good low-temperature toughness, high compressive strength and strong impact resistance. It boasts excellent load-bearing performance and is suitable for heavy machinery structural supports, high-pressure fluid transmission and low-temperature equipment.
20CrMo Precision Steel Pipe: A chromium-molybdenum alloy structural steel with good hardenability, high temperature resistance, fatigue resistance and high pressure resistance. After heat treatment, it retains sufficient core toughness and high surface hardness, applicable to high-pressure hydraulic systems, boiler pipelines and precision transmission parts.
42CrMo Precision Steel Pipe: A high-strength alloy structural steel with excellent comprehensive mechanical properties, high strength, good toughness, wear resistance and fatigue resistance. It can withstand heavy-load, high-speed and high-pressure working conditions, serving as a special material for core precision accessories of high-end machinery, automobile transmission systems and heavy-duty equipment.
3.2 General Dimension Range
Outer Diameter: 4mm–219mm, customized non-standard sizes are available
Wall Thickness: 1mm–20mm, customized thin and thick walls are supported
Standard Length: 3m–6m for factory delivery; customized fixed lengths from 1m to 12m and cutting service are available
3.3 Precision Tolerance Grade (GB/T 3639)
Outer Diameter Tolerance: High Grade ±0.05mm, Standard Grade ±0.10mm
Wall Thickness Tolerance: High Grade ±5%, Standard Grade ±10%
Surface Roughness: High Grade Ra≤0.4μm, Standard Grade Ra≤0.8μm; no oxide layers, cracks or pits on inner and outer walls
Geometric Tolerance: Straightness ≤0.3mm/m, Roundness ≤0.03mm/m; no bending or elliptical deformation
4. Production Process
Raw material selection → Precision rolling pretreatment of seamless pipes → Multi-pass cold rolling/cold drawing forming → Vacuum bright annealing (eliminating processing stress and refining grain structure) → Precision straightening → Fixed-length cutting → End face polishing → Eddy current/ultrasonic non-destructive testing → Dimensional precision inspection → Anti-rust surface treatment → Finished product packaging and warehousing. Strict full-process control ensures zero defective products.
5. Core Product Advantages
Ultra-high Dimensional Precision: Controllable tolerance meets IT7–IT13 precision assembly standards with no secondary turning and polishing required.
Mirror-smooth Inner Wall: Smooth inner and outer walls without oxide layers, low fluid resistance, no scale accumulation or leakage under high pressure.
Stable Mechanical Properties: Uniform material structure, no cracks after bending, flaring and flattening tests, pressure and burst resistance with a maximum burst strength of 30MPa.
Strong Adaptability: Multiple materials cover general, high-strength, heavy-load and high-pressure working conditions with flexible selection.
Cost and Efficiency Optimization: Direct assembly with qualified precision reduces machining procedures and increases material utilization rate by 15%–30%.
6. Standard Delivery States
BK (Hard State): No heat treatment after cold forming, featuring high hardness and rigidity, suitable for fixed structural parts without secondary processing.
GBK (Annealed State): Protected atmosphere bright annealing with excellent plasticity and toughness, easy for cutting, bending and deep processing, suitable for most machining scenarios.
NBK (Normalized State): Uniform metallographic structure, excellent cutting performance and balanced stable mechanical properties, ideal for precision mechanical parts processing.
7. Main Application Fields
Hydraulic and Pneumatic Industry: High and low pressure oil cylinders, air cylinder barrels, precision hydraulic oil pipes and hydraulic system pipelines with reliable tightness and pressure resistance.
Automobile Manufacturing Industry: Automobile transmission shafts, steering pipes, shock absorber pipes and chassis precision structural parts with high strength and fatigue resistance for lightweight applications.
General Machinery Manufacturing: Precision shaft sleeves, gear shafts, machine tool spindles, equipment connecting rods, bushings and other precision transmission parts.
Engineering Machinery and Heavy Industry: Heavy-duty equipment support structures, high-pressure transmission pipelines and load-bearing precision pipe fittings.
General Fluid Transmission: Medium and high-pressure transmission pipelines for industrial water, oil products, compressed air and other fluids.
8. Packaging and Delivery Instructions
Product Packaging: Dust-proof sealing for pipe ends, fully wrapped with moisture-proof and anti-rust film, reinforced with woven bags or solid wooden cases to prevent collision, rust and deformation during transportation.
Delivery Cycle: 5–7 working days for conventional in-stock specifications.
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