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{"title":"AISI 4140 Seamless Tubing Medium Carbon Alloy Steel Seamless Pipe For Mechanical","imgUrl":"https:\/\/img.chinax.com\/nimg\/ca\/78\/9a26badbdbdeb8106045decbd81e-200x200-1\/aisi_4140_seamless_tubing_medium_carbon_alloy_steel_seamless_pipe_for_mechanical.jpg","attrs":{"Brand Name":"TORICH","Model Number":"AISI 4140","Certification":"API,CE,ISO,ISO9001-2008,ISO9001","Place of Origin":"Zhejiang\/China"}}
This carbon steel cold-drawn, bright, precision-welded tube is specifically designed for automotive applications, particularly for use as shock absorber cylinders and related structural/hydraulic components. The manufacturing process involves forming a welded pre-tube shell followed by precise cold drawing to achieve tight tolerances, excellent surface finish, and superior dimensional control.
Specification
Process: Welded shell with cold draw finish
Outer Diameter (OD): Customizable from 10 mm to 400 mm
Wall Thickness (WT): 1 mm to 35 mm or more
Length: Up to 12,000 mm or per customer requirements
Surface: Bright cold-drawn finish with polished straightness
Tolerance: Tight dimensional control per precision tube standards
Key Features
High dimensional accuracy
Smooth bright surface finish
Improved mechanical properties
Good weldability and cost-effectiveness
Automotive-specific performance
Our Advantages
Strict control of straightness and concentricity
Tight tolerances on outer diameter and wall thickness
Optimized mechanical properties through cold-drawing
Material traceability and comprehensive inspection
Flexibility in engineering and customization
Specialization in automotive supply chain requirements
Chemical Composition
Steel Grade
C (max %)
Si (max %)
Mn (max %)
P (max %)
S (max %)
E155
0.11
0.35
0.70
0.025
0.025
E195
0.15
0.35
0.70
0.025
0.025
E235
0.17
0.35
1.20
0.025
0.025
E275
0.21
0.35
1.40
0.025
0.025
E355
0.22
0.35
1.60
0.025
0.025
Mechanical Properties
Steel Grade
Condition
Tensile Strength Rm (MPa)
Yield Strength ReH (MPa)
Elongation A (%)
E155
+C
400
--
6
E195
+C
420
--
6
E235
+C
490
--
6
E275
+C
560
--
5
E355
+C
640
--
4
E355
+SR
590
435
10
E355
+N
490-630
355
22
Standards Executed
GB/T 24187-2023 (Chinese standard for cold-drawn precision welded steel tubes)
EN 10305-2 (European standard for welded cold drawn tubes)
JIS G3445 (Japanese standard for machine structural carbon steel tubes)
DIN 2393/2394 (German standards for cold drawn precision tubes)
Application Areas
This precision tube product is designed for automotive and hydraulic systems, particularly for shock absorbers, hydraulic cylinders, and structural tubular components where precision, strength, and surface quality are critical.
Specific Use Cases
Inner or outer cylinder for vehicle shock absorbers
Hydraulic piston or rod tubes for automotive systems
Structural components in suspension or steering systems
Telescopic cylinder assemblies for commercial vehicles
Frequently Asked Questions
Are you a trading company or manufacturer?
We are a manufacturer that can also handle trading operations.
How long is your delivery time?
For goods in stock: 10-15 days. For goods not in stock: 30-40 days (depending on quantity).
Do you provide samples? Is it free or extra?
Yes, we provide samples free of charge, but customers must pay for freight costs.
What are your payment terms?
Payment ≤ $2,000 USD: 100% in advance. Payment ≥ $2,000 USD: 30% T/T in advance, balance before shipment.
