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Corrosion Resistant Automotive Brake Tube with Precision Dimensional Consistency

China Corrosion Resistant Automotive Brake Tube with Precision Dimensional Consistency

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Corrosion Resistant Automotive Brake Tube with Precision Dimensional Consistency

MOQ： 1Ton
Price： 800-1000 USD/Ton
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Material	Austenitic Stainless Steel
Delivery Time	20-30days upon products
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
Supply Ability	60000 Ton/Tons per Year
End Condition	Plain end or prepared for subsequent automotive flare forming
Main Grades	TP304, TP304L, TP316, TP316L, TP321
Payment Terms	L/C,D/A,D/P,T/T
Heat Treatment	Solution annealed according to the applicable material grade and standard
Product	Automotive Stainless Steel Seamless Brake Tube
Packaging Details	In bundles or in wooden boxes.
Typical Outside Diameter	4.75 mm, 6.00 mm
Model Number	Automotive Brake Tube
Certification	ISO9001 ISO 14001 TS16949
Brand Name	TORICH
Place of Origin	Zhejiang/China

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Product Specification


Material	Austenitic Stainless Steel	Delivery Time	20-30days upon products
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
Supply Ability	60000 Ton/Tons per Year	End Condition	Plain end or prepared for subsequent automotive flare forming
Main Grades	TP304, TP304L, TP316, TP316L, TP321	Payment Terms	L/C,D/A,D/P,T/T
Heat Treatment	Solution annealed according to the applicable material grade and standard	Product	Automotive Stainless Steel Seamless Brake Tube
Packaging Details	In bundles or in wooden boxes.	Typical Outside Diameter	4.75 mm, 6.00 mm
Model Number	Automotive Brake Tube	Certification	ISO9001 ISO 14001 TS16949
Brand Name	TORICH	Place of Origin	Zhejiang/China
High Light	Corrosion Resistant Automotive Brake Tube ，Precision Dimensional Consistency Brake Lines ，Solution Annealed Stainless Steel Seamless Pipe

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.

Company Details

Bronze Gleitlager

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from Quality China Factory

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Business Type:

Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller 
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Year Established:

1997 
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Total Annual:

25000000-30000000
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Employee Number:

100~200 
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Ecer Certification：

Verified Supplier 

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...

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TORICH INTERNATIONAL LIMITED
Suite 1604-3, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
https://www.precision-steeltube.com/

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