Temperature and gas
Check how hot the part will get, how long it stays hot and which gases it will be exposed to.
Heat-Resistant Ferritic Stainless Steel Round Bar
Stainless Steel 446 Round Bar Manufacturer, Exporter and Supplier
Stainless Steel 446 Round Bar (UNS S44600) is a stainless steel used for parts that work at high temperatures. It has a high amount of chromium, which helps protect the surface from oxidation. It is used in furnace parts, boiler baffles and heat-treatment equipment. Unlike SS 440C round bar, grade 446 is not hardened by normal heat treatment.
SS 446 is magnetic and is mainly chosen for heat resistance, not for high strength. Its performance depends on temperature, the surrounding gas and how long the part stays hot. For jobs that do not need the same heat resistance, SS 430 round bar may be worth comparing. Always check the required grade, size, condition and material test certificate before ordering.
At a glance
Stainless Steel 446 Round Bar quick facts
- Grade / UNS
- 446 / S44600
- Steel family
- High-chromium ferritic stainless steel
- Standard reference
- ASTM A276/A276M, where applicable
- Main characteristic
- Elevated-temperature oxidation resistance
- Hardening
- Not hardenable by conventional heat treatment
- Enquiry information
- Diameter, length, quantity, condition and operating environment
Check chemistry and certification against the specified standard and edition. Cross-standard designations are not automatically interchangeable.
Material overview
What Is Stainless Steel 446 Round Bar?
Stainless Steel 446 is a ferritic stainless steel with a high chromium content. Chromium forms a thin protective layer on the surface. This helps the metal resist oxidation in many hot environments. Grade 446 is magnetic and cannot be made harder by normal quenching.
It is mainly used when a part needs to resist heat and surface scaling. However, it can become brittle after long exposure to certain temperatures. The working temperature, gas and load all matter. If hardness and wear resistance are more important, compare SS 420 round bar and SS 440C round bar instead.
Buyer selection guide
How to Select Stainless Steel 446 Round Bar
First, check where the round bar will be used and how hot it will get. SS 446 is often selected for parts exposed to heat and oxidation. The part's load, size and working conditions must also be checked.
Grade and standardState SS 446 or UNS S44600 and the required ASTM or other product standard.
Size and finishGive the diameter, length, quantity, tolerance and required surface finish.
Working conditionsShare the operating temperature, type of gas, heating cycles and any load on the part.
Testing and documentsAsk for the heat number, material test certificate and any extra testing needed.
If you need a smoother surface or close size tolerance, ask about bright round bars. Check whether the required finish is available in grade 446.
Common applications
Applications of Stainless Steel 446 Round Bar
SS 446 round bar is used to make parts that face heat for long periods. The exact use depends on the temperature, working gas and load on the part.
- Furnace parts: Supports, rods and fittings used inside heating equipment.
- Boiler and burner parts: Baffles and other parts exposed to hot gases.
- Heat-treatment equipment: Fixtures and supports used during heating processes.
- Incinerators: Selected parts that need protection from oxidation.
- Heat-processing equipment: Supports and fittings in suitable heat exchangers and related systems.
For parts working at lower temperatures, compare other stainless steel round bars. Grade 446 should be chosen only after checking the actual service conditions.
Product specifications
Stainless Steel 446 Round Bar Sizes and Specifications
When asking for SS 446 round bar, give the exact size and material standard. Available sizes, finishes and lengths must be checked before placing an order.
| Item | Details |
|---|---|
| Grade | Stainless Steel 446 / UNS S44600 |
| Standard | ASTM A276/A276M, when required |
| Diameter | As per requirement and confirmed availability |
| Length | Standard or cut length, subject to availability |
| Finish | Hot finished, turned, ground or bright finished, where available |
| Condition | Specify the required delivery condition |
| Documents | Material test certificate, heat number and any agreed inspection reports |
Other shapes, such as hexagonal bars and flat bars, may also be requested. Confirm the grade and size before ordering.
Chemical composition
Chemical Composition of Stainless Steel 446 Round Bar
The table below shows the composition values listed in the original product information. Actual limits must be checked against the required material standard and test certificate.
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 23.0–27.0 |
| Carbon (C) | 0.20 max |
| Manganese (Mn) | 1.50 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 0.75 max |
| Nickel (Ni) | 0.50, as listed in the original page |
| Nitrogen (N) | 0.25 max, as listed in the original page |
These values are for reference only. Check the required standard and material test certificate before using them for inspection or acceptance.
Mechanical properties
Mechanical Properties of Stainless Steel 446 Round Bar
The strength and other properties of SS 446 depend on the bar size, how it is made and its delivery condition. The figures below come from the original page and are shown only as general reference values.
| Property | Original page reference |
|---|---|
| Density | 7.5 g/cm³ |
| Melting point | About 1510 °C |
| Tensile strength | 485 MPa |
| 0.2% yield strength | 275 MPa |
| Elongation | 20% |
Good resistance to oxidation does not mean the steel can carry a heavy load at high temperatures. Always check the strength needed for the actual working temperature and request the correct test documents.
Things to check
What to Check Before Using Stainless Steel 446 Round Bar
Welding and forming
Check the correct welding or forming method before making the part. Heating can affect this grade.
Load and service life
Make sure the material can handle the required load and repeated heating or cooling.
Testing and traceability
Ask for the heat number, material test certificate and inspection reports required for the order.
Grade designations
Stainless Steel 446 Grades and Designations
The names below appear in the original product information. Do not assume they all have exactly the same chemical limits. Check the relevant standards before using one grade in place of another.
| System | Grade or name |
|---|---|
| AISI / ASTM | 446 |
| UNS | S44600 |
| JIS | SUS 446 |
| European reference in original page | 1.4762 / X10CrAl24. Check before substituting. |
| Trade name listed on original page | Sicromal 12. Not an automatic equivalent. |
Product questions
Stainless Steel 446 Round Bar FAQ
What is stainless steel 446 round bar used for?
SS 446 round bar is used to make parts for furnaces, boilers and other equipment that works at high temperatures. The working temperature and load must be checked first.
Is stainless steel 446 magnetic?
Yes. SS 446 is a ferritic stainless steel and is normally magnetic.
Can stainless steel 446 be hardened by heat treatment?
No. SS 446 cannot be hardened by normal heat treatment. However, long exposure to heat can change its properties.
What is the difference between SS 446 and SS 430?
SS 446 has more chromium and is mainly used where heat and oxidation resistance are important. SS 430 is commonly used for parts that need general corrosion resistance at lower temperatures.
Are SS 446 and DIN 1.4762 the same?
They are often compared, but their chemical limits may differ. Check the required standard and material test certificate before treating them as equal.
What details should I send for a quotation?
Share the grade, standard, diameter, length, quantity, finish, working temperature, testing needs and delivery location.