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ASTM A513 Type 2 MT 1010 Cold Rolled ERW Automotive Seat Frame Tube is a precision mechanical steel tube manufactured from cold-rolled low-carbon steel strip by electric resistance welding. ASTM A513 Type 2 specifically covers as-welded tubing produced from cold-rolled steel, providing a cleaner surface, tighter dimensional control, and better forming consistency than conventional hot-rolled ERW tubing.
MT 1010 / SAE 1010 low-carbon steel is particularly suitable for automotive seat structures because its low carbon content combines adequate structural strength with good bending, flattening, stamping, welding, and end-forming capability. The tubing can be supplied as round, square, rectangular, or customer-specific sections for subsequent bending, piercing, welding, coating, and seat-frame assembly.
Product Specifications
Item
Specification
Product
Automotive Seat Frame Tube
Standard
ASTM A513 / A513M
Type
Type 2 - As-Welded Cold-Rolled Steel, A.W.C.R.
Main Grade
MT 1010 / SAE 1010
Material
Low-Carbon Steel
Manufacturing Process
Cold-Rolled Steel Strip → Roll Forming → High-Frequency ERW → Weld-Bead Control → Sizing → Straightening → Cutting
Tube Shape
Round, Square, Rectangular or Special Section
Outside Diameter
ASTM A513 Type 2 round tubing range: approximately 9.5-300 mm
Wall Thickness
ASTM A513 Type 2 range: approximately 0.56-3.40 mm
Typical Automotive Range
OD 12-60 mm; WT 0.8-2.5 mm, depending on seat-frame design
Length
1-12 m, customizable; fixed-length cutting available
OD Tolerance
According to ASTM A513 Type 2 dimensional tables; tighter project-specific tolerances available by agreement
Typical Small-Diameter OD Control
ASTM Type 2 tolerance can reach approximately ±0.08 to ±0.09 mm for specified smaller size ranges
Wall Thickness Tolerance
According to ASTM A513 requirements and ordered wall/diameter combination
Straightness
Standard control according to ASTM A513; tighter straightness can be specified for automated bending and welding
Weld Seam
Internal weld flash as-produced or controlled according to purchase specification
Surface Condition
Cold-rolled bright surface, lightly oiled, dry surface, phosphate-ready or coating-ready
Heat Treatment
Normally supplied as-welded; stress-relieving or annealing available when forming requirements justify it
Processing
Precision cutting, bending, punching, drilling, swaging, end forming and welded assemblies available
Inspection
Dimensional inspection, tensile testing, hardness testing, flattening/flaring where specified, weld inspection and material traceability
Documentation
Mill Test Certificate / EN 10204 3.1 documentation available according to order requirements
Main Characteristics
Controlled Strength and Formability
MT 1010 is a low-carbon steel grade designed to maintain a practical balance between structural strength and forming capability.
Typical minimum mechanical properties for ASTM A513 Type 2 Grade 1010 round tubing include:
Yield Strength: approximately 221 MPa minimum
Tensile Strength: approximately 310 MPa minimum
Elongation: approximately 15% minimum
Rockwell B Hardness: approximately 55 minimum depending on dimensional and delivery conditions
This combination is appropriate where automotive seat-frame components require multiple bending operations without unnecessarily increasing material strength and springback.
Cold-Rolled Surface Quality
Unlike ASTM A513 Type 1 tubing manufactured from hot-rolled steel, Type 2 tubing is produced from cold-rolled steel strip.
The resulting surface provides:
reduced mill-scale contamination;
more uniform surface appearance;
improved suitability for powder coating or electrophoretic coating preparation;
better dimensional repeatability;
improved consistency during automated bending and fixture positioning.
Dimensional Repeatability for Seat-Frame Fabrication
For selected Type 2 small-diameter round tubing ranges, ASTM A513 outside-diameter tolerances can be approximately ±0.08 to ±0.09 mm.
This is important for seat-frame production because dimensional variation directly affects:
CNC tube-bender setup;
bend-radius repeatability;
robotic welding fixtures;
bracket positioning;
hole alignment;
final seat-frame geometry.
Our Advantages
1. Controlled Tube Geometry for Automated Bending
A common automotive purchasing concern is not simply whether the tube meets ASTM A513, but whether different production batches behave consistently in CNC bending equipment.
For seat-frame projects, production control can therefore be established around:
fixed OD tolerance;
controlled wall-thickness variation;
specified ovality;
specified straightness;
consistent material hardness;
batch-to-batch forming verification.
For critical bent components, dimensional requirements can be agreed according to the customer's drawing rather than relying only on general commercial tubing tolerances.
2. Weld-Seam Control for Bending and Secondary Processing
The ERW seam position and internal weld flash can influence tube bending, punching, swaging and end forming.
Seat-frame projects can therefore specify:
controlled internal weld flash;
weld-seam orientation marking;
seam-position requirements relative to bending direction;
weld integrity inspection;
trial bending before mass production.
This reduces the risk of weld-area cracking, excessive distortion, tool interference or inconsistent bending behavior during component production.
3. Production Based on the Finished Seat Component
Automotive buyers frequently require more than straight tube.
Tube production parameters can be developed around the finished component drawing, including:
fixed-length cutting;
CNC bending;
laser or mechanical hole processing;
punching;
flattening;
swaging;
expanding or reducing;
end forming;
bracket welding;
dimensional fixture inspection.
This approach allows tube tolerance, weld-seam position and forming characteristics to be evaluated together rather than as independent specifications.
Execution Standards
Standard System
Relevant Standard / Reference
Description
ASTM
ASTM A513 / A513M
Electric-resistance-welded carbon and alloy steel mechanical tubing
SAE
SAE 1010
Common low-carbon chemistry designation corresponding to the 1010 material family
EN
EN 10305-3
Welded cold-sized precision steel tubes; commonly considered for comparable European precision-tube applications
JIS
JIS G3445
Carbon steel tubes for machine structural purposes
Selection should be confirmed according to required dimensions, mechanical properties and application
Chemical Composition
Grade
C %
Mn %
P % Max.
S % Max.
1008
0.10 max.
0.50 max.
0.035
0.035
1010
0.08-0.13
0.30-0.60
0.035
0.035
1015
0.13-0.18
0.30-0.60
0.035
0.035
1020
0.18-0.23
0.30-0.60
0.035
0.035
1026
0.22-0.28
0.60-0.90
0.035
0.035
Mechanical Properties
Property
1008
1010
1015
1020
1026
Yield Strength, Min.
207 MPa
221 MPa
241 MPa
262 MPa
310 MPa
Tensile Strength, Min.
290 MPa
310 MPa
331 MPa
359 MPa
427 MPa
Elongation in 50 mm, Min.
15%
15%
15%
12%
12%
Typical Rockwell B Minimum
50
55
58
62
68
Relative Formability
Excellent
Excellent
Very Good
Good
Moderate
Relative Strength
Lower
Low-Medium
Medium
Medium-High
Higher
Why MT 1010 for Automotive Seat Frames?
Compared with higher-carbon grades such as 1020 or 1026, MT 1010 normally provides lower yield strength and therefore requires less force during bending and forming.
This can benefit automotive seat-frame manufacturing by reducing:
bending springback;
forming-tool load;
risk of cracking at tight bends;
difficulty during flattening or swaging;
variability during welding and subsequent forming.
Compared with hot-rolled ERW tubing, ASTM A513 Type 2 cold-rolled ERW tube additionally provides better surface condition and dimensional consistency.
Compared with DOM tubing, Type 2 ERW tubing is normally more economical where extremely tight ID control or very high mechanical properties are not required.
For this reason, ASTM A513 Type 2 MT 1010 is a practical material choice for high-volume automotive seat structures where cost, repeatable forming and weldability must be balanced.
Application
Automotive Front Seat Backrest Frame
One specific application is the tubular perimeter and reinforcement structure used in an automotive front seat backrest frame.
The tube is typically cut, CNC bent, locally flattened or pierced and welded to brackets, recliner interfaces and reinforcement components.
For this application, important purchasing parameters normally include:
tube OD and wall-thickness consistency;
bend performance;
weld-seam integrity;
weld-flash height;
straightness;
material hardness;
hole and bracket positioning after forming;
surface condition before electrophoretic or powder coating;
batch traceability.
The final tube specification should therefore be defined together with the seat-frame drawing, bend geometry, joining process and assembly tolerance rather than by material grade alone.
Frequently Asked Questions
Q: Are you trading company or manufacturer?
A: manufacturer, also can do trading.
Q: How long is your delivery time?
A: Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? is it free or extra?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment?
A: Payment ≤ 2000USD, 100% in advance. Payment ≥ 2000USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
Company Overview
A Professional Steel Tube Manufacturer and Solution Provider
TORICH INTERNATIONAL LIMITED integrates steel tube manufacturing, international trade, warehousing, technical support and customized processing. Our manufacturing operations cover cold drawing, cold rolling, heat treat...
Company Overview
A Professional Steel Tube Manufacturer and Solution Provider
TORICH INTERNATIONAL LIMITED integrates steel tube manufacturing, international trade, warehousing, technical support and customized processing. Our manufacturing operations cover cold drawing, cold rolling, heat treat...
