Corrosion Resistant Automotive Brake Tube with Precision Dimensional Consistency and Solution Annealed Stainless Steel Seamless Pipe Brake Lines
Basic Properties
Place of Origin:
Zhejiang/China
Brand Name:
TORICH
Certification:
ISO9001 ISO 14001 TS16949
Model Number:
Automotive Brake Tube
Trading Properties
Minimum Order Quantity:
1Ton
Price:
800-1000 USD/Ton
Payment Terms:
L/C,D/A,D/P,T/T
Supply Ability:
60000 Ton/Tons per Year
Product Summary
Automotive Brake Tube Stainless Steel Seamless Pipe Brake Lines Automotive stainless steel seamless brake tubing is designed for rigid hydraulic brake-line systems where corrosion resistance, dimensional consistency, pressure integrity, and reliable flare formation are critical. Austenitic stainless ...
Product Details
Highlight:
Corrosion Resistant Automotive Brake Tube
,Precision Dimensional Consistency Brake Lines
,Solution Annealed Stainless Steel Seamless Pipe
Product:
Automotive Stainless Steel Seamless Brake Tube
Material:
Austenitic Stainless Steel
Main Grades:
TP304, TP304L, TP316, TP316L, TP321
Typical Outside Diameter:
4.75 Mm, 6.00 Mm
Typical Wall Thickness:
0.5–1.5 Mm
Common Brake-Line Size:
4.75 × 0.70 Mm, 4.75 × 0.90 Mm, 6.00 × 0.70 Mm, 6.00 × 1.00 Mm
Heat Treatment:
Solution Annealed According To The Applicable Material Grade And Standard
End Condition:
Plain End Or Prepared For Subsequent Automotive Flare Forming
Product Description
Automotive Brake Tube Stainless Steel Seamless Pipe Brake Lines
Automotive stainless steel seamless brake tubing is designed for rigid hydraulic brake-line systems where corrosion resistance, dimensional consistency, pressure integrity, and reliable flare formation are critical. Austenitic stainless steel grades such as TP304, TP304L, TP316, TP316L, and TP321 can be manufactured as cold-drawn seamless precision tubing, with 4.75 mm and 6.00 mm outside diameters being common brake-pipe dimensions.
For automotive brake-line projects, the stainless tube material specification and the brake connection specification should be considered separately. ASTM A269/A269M can be used to define stainless steel tube material and manufacturing requirements, while ISO 4038, ISO 13486-1, or DIN 74234 can be specified for applicable brake-pipe flare and connection geometry.
Specifications
| Item | Specification |
|---|---|
| Product | Automotive Stainless Steel Seamless Brake Tube |
| Material | Austenitic Stainless Steel |
| Main Grades | TP304, TP304L, TP316, TP316L, TP321 |
| Manufacturing Process | Seamless, Cold Drawn |
| Typical Standards | ASTM A269/A269M, EN 10216-5, JIS G3459, GOST 9941, GB/T 14976 |
| Brake Connection References | ISO 4038, ISO 13486-1, DIN 74234 |
| Typical Outside Diameter | 4.75 mm, 6.00 mm |
| Custom Outside Diameter | Approximately 3.0-16.0 mm subject to technical confirmation |
| Typical Wall Thickness | 0.5-1.5 mm |
| Common Brake-Line Size | 4.75 × 0.70 mm, 4.75 × 0.90 mm, 6.00 × 0.70 mm, 6.00 × 1.00 mm |
| Length | 1-12 m, cut lengths customizable |
| Coil Supply | Available by agreement for suitable sizes |
| OD Tolerance | Precision tolerance available according to ordered standard and drawing |
| Wall Thickness Tolerance | According to ordered material standard or customer drawing |
| Straightness | Controlled for straight-length tube; special straightness requirement available by agreement |
| Surface Condition | Bright annealed, pickled/passivated, polished, or customized |
| Internal Surface | Clean, free from harmful scale, oil residue, and loose particles |
| Heat Treatment | Solution annealed according to the applicable material grade and standard |
| End Condition | Plain end or prepared for subsequent automotive flare forming |
| Inspection | Dimensional inspection, tensile test, hardness test, hydrostatic or nondestructive testing as specified |
| Documentation | Mill Test Certificate / Inspection Certificate available according to purchase specification |
Main Features
High Corrosion Resistance
TP304 and TP304L contain approximately 18.0-20.0% chromium and provide good resistance to atmospheric moisture and general road environments.
TP316 and TP316L additionally contain approximately 2.0-3.0% molybdenum. The molybdenum addition improves resistance to localized corrosion compared with standard 304 grades, making 316-series tubing particularly suitable where brake lines are exposed to chloride-containing moisture and road de-icing environments.
Controlled Mechanical Strength
Under ASTM A269 requirements, typical minimum room-temperature tensile properties include:
- TP304: minimum tensile strength 515 MPa and minimum yield strength 205 MPa
- TP304L: minimum tensile strength 485 MPa and minimum yield strength 170 MPa
- TP316: minimum tensile strength 515 MPa and minimum yield strength 205 MPa
- TP316L: minimum tensile strength 485 MPa and minimum yield strength 170 MPa
- TP321: minimum tensile strength 515 MPa and minimum yield strength 205 MPa
These values provide a controlled material basis for subsequent bending, routing, and end forming.
Suitable for Precision Brake-Line Forming
Cold-drawn seamless production provides continuous tube walls without a longitudinal weld seam. For brake-line fabrication, this helps maintain consistent circumferential behavior during bending and flare preparation.
Tube dimensions, material condition, and final flare geometry must nevertheless be matched to the applicable brake-system specification rather than evaluated from material grade alone.
Solution-Annealed Austenitic Structure
ASTM A269 austenitic grades are generally supplied after solution heat treatment. For TP304, TP304L, TP316, TP316L, and TP321, a minimum solution-treatment temperature around 1040°C is specified under ASTM A269 requirements.
This treatment restores corrosion-resistant austenitic structure and provides suitable ductility for subsequent fabrication.
Our Advantages
How Do You Control Tube Quality Before Brake-Line Flaring?
Professional brake-line buyers are concerned not only with nominal OD and wall thickness, but also with dimensional consistency, end condition, surface defects, and forming behavior.
We can control production around the customer's final flare and assembly requirements rather than treating the product as ordinary general-purpose tubing. OD, wall thickness, ovality, surface condition, end condition, and heat-treatment state can be specified on the purchase drawing.
For projects using standardized connections, the tube can be supplied for subsequent forming according to ISO 4038, ISO 13486-1, DIN 74234, or customer-specific automotive drawings.
How Is Material Traceability Controlled?
Each production lot can be linked to the corresponding heat number and material inspection records. Chemical composition and mechanical properties can be verified against the ordered stainless steel standard.
For automotive projects requiring controlled incoming inspection, documentation can include material grade, heat number, dimensions, test results, and inspection certification according to the agreed purchase specification.
Positive material identification can also be arranged when required.
How Do You Reduce Corrosion and Internal Cleanliness Risks?
Brake tubing is exposed externally to water, salts, mud, temperature cycling, and vehicle underbody contaminants, while its internal surface must remain clean for hydraulic service.
TP316 and TP316L can be selected when greater resistance to chloride-containing environments is required. Bright annealing, pickling/passivation, or specified surface cleaning can be used depending on the procurement requirement.
Tube ends can also be protected during packaging to reduce contamination by dust, metal particles, moisture, and foreign matter before brake-line fabrication.
Execution Standards
| Standard System | Reference Standard | Application |
|---|---|---|
| ASTM | ASTM A269/A269M | Seamless and welded austenitic stainless steel tubing for general service |
| EN | EN 10216-5 | Seamless stainless steel tubes for pressure purposes |
| GOST | GOST 9941 | Cold- and warm-deformed seamless corrosion-resistant steel tubes |
| JIS | JIS G3459 | Stainless steel pipes for corrosion-resistant service |
| GB | GB/T 14976 | Seamless stainless steel tubes for fluid transport |
| ISO | ISO 4038 | Hydraulic braking systems, single-flare pipe and connection geometry |
| ISO | ISO 13486-1 | Hydraulic braking systems, double-flare pipes and associated connections |
| DIN | DIN 74234 | Hydraulic braking-system brake pipes and flares |
Application
Passenger Car Hydraulic Brake Hard Line
The tube is used as the rigid hydraulic brake pipe connecting components such as the master-cylinder/ABS hydraulic unit and the wheel-end flexible brake hose.
For this application, 4.75 mm OD tubing is widely used in brake-line systems. The selected stainless steel tube is bent along the vehicle body and formed at the ends to match the specified brake fittings and flare seats.
Final brake-line suitability depends on the complete combination of tube dimensions, wall thickness, material temper, bending radius, flare configuration, fittings, proof pressure, burst pressure, cleanliness, and corrosion-validation requirements defined by the vehicle or brake-system manufacturer.
Chemical Composition
| Grade | UNS | C Max. | Mn Max. | P Max. | S Max. | Si Max. | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|---|
| TP304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-11.0 | -- | N ≤ 0.10 |
| TP304L | S30403 | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-12.0 | -- | N ≤ 0.10 |
| TP316 | S31600 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | N ≤ 0.10 |
| TP316L | S31603 | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 10.0-15.0 | 2.00-3.00 | N ≤ 0.10 |
| TP321 | S32100 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-12.0 | -- | Ti: 5 × C min., 0.70 max. |
Mechanical Properties
| Grade | UNS | Tensile Strength Min. | Yield Strength Min. | Elongation Min. | Maximum Hardness |
|---|---|---|---|---|---|
| TP304 | S30400 | 515 MPa | 205 MPa | 35% | 192 HBW / 200 HV / 90 HRB |
| TP304L | S30403 | 485 MPa | 170 MPa | 35% | 192 HBW / 200 HV / 90 HRB |
| TP316 | S31600 | 515 MPa | 205 MPa | 35% | 192 HBW / 200 HV / 90 HRB |
| TP316L | S31603 | 485 MPa | 170 MPa | 35% | 192 HBW / 200 HV / 90 HRB |
| TP321 | S32100 | 515 MPa | 205 MPa | 35% | 192 HBW / 200 HV / 90 HRB |
Grade Selection Guide
| Grade | Selection Consideration |
|---|---|
| TP304 | General-purpose austenitic stainless grade with good corrosion resistance and formability |
| TP304L | Low-carbon version of 304, suitable where reduced sensitization risk is required |
| TP316 | Molybdenum-bearing stainless grade with improved resistance to chloride-containing environments |
| TP316L | Low-carbon molybdenum-bearing grade combining improved chloride resistance with reduced sensitization risk |
| TP321 | Titanium-stabilized stainless grade intended for applications requiring improved resistance to sensitization during elevated-temperature exposure |
Frequently Asked Questions
Are you trading company or manufacturer?
Manufacturer, also can do trading.
How long is your delivery time?
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, according to quantity.
Do you provide samples? Is it free or extra?
Yes, we could offer the sample for free charge but need pay the cost of freight.
What is your terms of payment?
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.
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