Sulfinert-Treated 316L Stainless Steel Tubing Precision Straight for Chromatography Applications
Basic Properties
Place of Origin:
ZheJiang/China
Brand Name:
TORICH
Certification:
ISO9001 ISO 14001 TS16949
Model Number:
ASTM A249
Trading Properties
Minimum Order Quantity:
1Ton
Price:
800-1000 USD/Ton
Payment Terms:
L/C,D/A,D/P,T/T,Western Union
Supply Ability:
60000 Ton/Tons per Year
Product Summary
Sulfinert Tubing Straight Stainless Steel Tubing For Chromatography Applications Product Overview Sulfinert-treated straight stainless steel tubing is designed for chromatography flow paths where active compounds must be transferred without adsorption, memory effect, or metallic surface interaction. ...
Product Details
Material:
304, 304L, 316, 316L, 321 Austenitic Stainless Steel
Base Standard:
ASTM A269 / ASTM A213 / ASTM A249; EN 10216-5 / EN 10217-7; JIS G3459; GB/T 14976; GOST 9941
Preferred Grade:
316L Stainless Steel For Chromatography Transfer Lines
Outer Diameter:
Common Chromatography Sizes: 1/16", 1/8", 1/4", 3/8" OD; Custom Metric Sizes Available
Wall Thickness:
Common: 0.010", 0.020", 0.028", 0.035"; Custom Wall Thickness By Pressure And Fitting Requirement
Length:
Straight Sticks Commonly 6 Ft ± 1/2"; Base Tubing Can Be Supplied In 1–12 M Lengths, While Sulfinert-coated Straight Lengths Depend On Coating Capability And Validation
Straightness:
≤1.5 Mm/m For Precision Straight Tubing; Tighter Straightness By Agreement
Heat Treatment:
Solution Annealed / Bright Annealed; ASTM A269 Material Is Supplied In Heat-treated Condition
Product Description
Sulfinert Tubing Straight Stainless Steel Tubing For Chromatography Applications
Product Overview
Sulfinert-treated straight stainless steel tubing is designed for chromatography flow paths where active compounds must be transferred without adsorption, memory effect, or metallic surface interaction. In current technical usage, Sulfinert is closely associated with SilcoTek's inert amorphous-silicon CVD coating family, also marketed as SilcoNert 2000, while Restek continues to use the Sulfinert name for treated chromatography components. The base tubing is typically seamless or welded/drawn 304 or 316L stainless steel, with 316L preferred for higher corrosion resistance and cleaner analytical flow paths.
Specifications
| Item | Specification |
|---|---|
| Material | 304, 304L, 316, 316L, 321 austenitic stainless steel |
| Base Standard | ASTM A269 / ASTM A213 / ASTM A249; EN 10216-5 / EN 10217-7; JIS G3459; GB/T 14976; GOST 9941 |
| Preferred Grade | 316L stainless steel for chromatography transfer lines |
| Outer Diameter | Common chromatography sizes: 1/16", 1/8", 1/4", 3/8" OD; custom metric sizes available |
| Wall Thickness | Common: 0.010", 0.020", 0.028", 0.035"; custom wall thickness by pressure and fitting requirement |
| Length | Straight sticks commonly 6 ft ± 1/2"; base tubing can be supplied in 1-12 m lengths, while Sulfinert-coated straight lengths depend on coating capability and validation |
| Tolerance Range | OD tolerance controlled according to ASTM A269 or customer drawing; tighter tolerance available for ferrule sealing zones |
| Straightness | ≤1.5 mm/m for precision straight tubing; tighter straightness by agreement |
| Surface Condition | Seamless bright annealed, welded/drawn, electropolished ID, Sulfinert-treated internal surface; external coating optional depending on process |
| Heat Treatment | Solution annealed / bright annealed; ASTM A269 material is supplied in heat-treated condition |
| Testing | Dimensional inspection, visual inspection, hardness test, flaring/flange/reverse flattening where applicable, hydrostatic or nondestructive electric test under ASTM A269 |
ASTM A269 covers nominal-wall seamless and welded austenitic stainless steel tubing for general corrosion-resisting and low- or high-temperature service, and requires heat-treated material, chemical composition compliance, mechanical tests, and hydrostatic or nondestructive electric testing.
Main Characteristics
- Low adsorption flow path for trace analysis
Sulfinert / SilcoNert 2000 creates an amorphous silicon barrier on stainless steel surfaces to reduce adsorption of active compounds. SilcoTek data describes a 100-250 nm coating thickness, with surface passivation verified by a water contact angle greater than 75°. - Designed for ppb-level organo-sulfur analysis
Restek identifies Sulfinert treatment as required for metal components used in parts-per-billion organo-sulfur analysis. In SilcoTek testing, untreated tubing showed long adsorption and stabilization delays for methyl mercaptan, while SilcoNert-treated tubing showed no measurable adsorption under the reported test condition. - CVD coating coverage inside complex flow paths
The coating is applied by chemical vapor deposition, a non-line-of-sight process that can coat high-aspect-ratio internal surfaces, sub-micron openings, edges, GC weldments, columns, and transfer tubing. - Straight tubing sizes suitable for chromatography systems
Commercial Sulfinert-treated straight 316L tubing is commonly supplied in 6 ft straight pieces, including 1/8", 1/4", and 3/8" OD options, and can be cut to exact system length with a standard tubing cutter. - Controlled bend guidance for coated tubing
For coated tubing, common minimum bend radius guidance is approximately 16 × OD: 1/8" OD -> 2", 1/4" OD -> 4", and 3/8" OD -> 6".
Our Advantages
| Professional Concern | Practical Solution |
|---|---|
| Active sulfur compounds may adsorb to untreated stainless steel and cause delayed or false chromatographic response. | We specify Sulfinert-treated ID surfaces for trace sulfur, VOC, refinery gas, and environmental sampling lines, reducing memory effect in the sample path. |
| Coating thickness may affect compression fittings or dead volume. | The inert CVD layer is ultra-thin, typically 100-250 nm, so the tubing keeps standard OD geometry and can still be used with chromatography compression fittings when cut and deburred correctly. |
| Buyers need base-metal traceability, not only coating claims. | Tubes can be supplied with stainless steel grade certificate, ASTM A269 dimensional inspection, heat-treatment record, surface condition control, and coating batch documentation. |
Execution Standards
| Standard System | Applicable Standard | Short Description |
|---|---|---|
| ASTM | ASTM A269 / A269M | Seamless and welded austenitic stainless steel tubing for general service |
| ASTM | ASTM A213 / A249 | Seamless or welded stainless tubing where heat exchanger or higher test requirements are specified |
| EN | EN 10216-5 / EN 10217-7 | Seamless or welded stainless steel tubes for pressure and technical service |
| JIS | JIS G3459 | Stainless steel pipes for corrosion-resistant and temperature service |
| GB | GB/T 14976 | Seamless stainless steel pipes for fluid transport |
| GOST | GOST 9941 | Seamless cold- and warm-deformed corrosion-resistant steel tubes |
Application Field
Gas chromatography sulfur compound analyzer sample-transfer line -- used between sampling cylinder, valve system, GC inlet, sulfur chemiluminescence detector, or related trace-sulfur analytical module.
Chemical Composition
| Grade | UNS | C max | Mn max | Si max | P max | S max | Cr | Ni | Mo | N max | Other |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TP304 | S30400 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 | -- | 0.10 | -- |
| TP304L | S30403 | 0.030 | 2.00 | 0.75 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | -- | 0.10 | -- |
| TP316 | S31600 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | 0.10 | -- |
| TP316L | S31603 | 0.030 | 2.00 | 0.75 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | 0.10 | -- |
| TP321 | S32100 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0-19.0 | 9.0-12.0 | -- | 0.10 | Ti = 5 × (C+N) to 0.70 |
Mechanical Properties
| Grade | Tensile Strength min, MPa | Yield Strength 0.2% min, MPa | Elongation in 50 mm min, % | Rockwell B max | Brinell HB max |
|---|---|---|---|---|---|
| TP304 | 515 | 205 | 40 | 92 | 201 |
| TP304L | 485 | 170 | 40 | 92 | 201 |
| TP316 | 515 | 205 | 40 | 95 | 217 |
| TP316L | 485 | 170 | 40 | 95 | 217 |
| TP321 | 515 | 205 | 40 | 95 | 217 |
Product Images
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 <= 2000 USD, 100% in advance. Payment >= 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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