Amardeep Steel supplies Stainless Steel 443 seamless pipes and tubes to ASTM A268 grade TP443 (UNS S44300), a ferritic stainless steel with 18% to 23% chromium and about 1% copper. It is magnetic, nickel free and resists oxidation and many corrosive media better than 430. Compare our SS 430 tubes and SS 439 tubes, and browse all SS seamless pipes and tubes.
Every order comes with mill test certificates to EN 10204 3.1 and full heat traceability.
What Are Stainless Steel 443 Seamless Pipes and Tubes?
TP443 is one of the ferritic grades listed in ASTM A268, the specification for seamless and welded ferritic and martensitic stainless steel tubing for general service. Its copper addition of 0.90% to 1.25% improves resistance to some reducing acids, and its high chromium gives good oxidation resistance.
Two Grades Called "443"
The traditional Type 443 is UNS S44300, the grade in ASTM A268. A newer ferritic steel sold as "443" (UNS S44330) has about 21% chromium, low carbon, copper and titanium or niobium stabilization, and is used mainly as sheet. This page covers TP443 (S44300) tube. If your drawing names S44330, tell us with your enquiry.
SS 443 Seamless Tube Specifications
Parameter | Details |
|---|---|
Grade | Stainless Steel 443 (TP443) |
UNS | S44300 |
Standard | ASTM A268 / ASME SA268 |
Type | Seamless, hot finished and cold drawn |
Outside Diameter | Tube and pipe sizes to the purchase specification, small and medium bore |
Length | Random lengths, fixed lengths and cut lengths |
Ends | Plain end and bevelled end |
Heat Treatment | Annealed |
Test Certificate | EN 10204 3.1, with 3.2 available on request |
SS 443 Chemical Composition
Element | Content (%) |
|---|---|
Carbon (C) | 0.20 max |
Chromium (Cr) | 18.0 to 23.0 |
Copper (Cu) | 0.90 to 1.25 |
Manganese (Mn) | 1.00 max |
Silicon (Si) | 1.00 max |
Phosphorus (P) | 0.040 max |
Sulfur (S) | 0.030 max |
SS 443 Mechanical Properties
Minimum tensile, yield and elongation values for TP443 are set in the ASTM A268 tensile table and stated on the mill certificate. Confirm the values for the A268 edition on your order.
SS 430 vs 442 vs 443
Property | SS 430 | SS 442 | SS 443 (TP443) |
|---|---|---|---|
Chromium | 16 to 18% | 18 to 23% | 18 to 23% |
Copper | Not specified | Not specified | 0.90 to 1.25% |
Carbon, max | 0.12% | 0.20% | 0.20% |
Tube standard | ASTM A268 TP430 | Purchase specification | ASTM A268 TP443 |
For scaling resistance without copper, see our SS 442 seamless pipes and tubes.
Applications of SS 443 Seamless Pipes and Tubes
- Chemical process tubing in mildly reducing media
- Heat exchanger tubes; see our heat exchanger tubes
- Furnace and oven parts
- Food processing and kitchen equipment tubing
Testing and Documentation
Every order of SS 443 seamless tube goes through the checks below at our testing facility or approved third party labs.
- Chemical analysis
- Tension test
- Flattening and flaring tests
- Hardness test
- Hydrostatic or eddy current test
- PMI and visual and dimensional inspection
Mill test certificates are issued to EN 10204 3.1, with 3.2 available on request. You can view our approvals on the certificates page.
Packing and Marking
Each length is marked with ASTM A268, TP443, size, heat number and manufacturer name. Ends are capped and tubes are packed in bundles or wooden boxes for export. Read more about our packing and despatch process.
Request a Quote for Stainless Steel 443 Seamless Pipes & Tubes
Send us the OD, wall thickness, length, quantity and whether your drawing calls for S44300 or S44330, and our team will reply with price and delivery. Use the enquiry form or reach us through the contact page.
Frequently Asked Questions
What is Stainless Steel 443?
Stainless Steel 443 (UNS S44300, ASTM A268 TP443) is a ferritic stainless steel with 18% to 23% chromium and 0.90% to 1.25% copper, used for oxidation and corrosion resistance in tube form.
Is SS 443 covered by ASTM A268?
Yes. TP443 (UNS S44300) is one of the ferritic grades in ASTM A268 / ASME SA268 for seamless and welded tubing for general service.
What is the difference between UNS S44300 and S44330?
S44300 is the traditional Type 443 with up to 0.20% carbon and copper. S44330 is a newer 21% chromium ferritic grade with low carbon, copper and titanium or niobium stabilization, mainly sold as sheet.
Is SS 443 magnetic?
Yes. SS 443 is a ferritic stainless steel and is magnetic.
