Specialty Round Bars
Custom 450 Round Bar
Custom 450 Round Bar (UNS S45000) is a martensitic, precipitation-hardenable stainless steel bar offering a useful balance of corrosion resistance, strength and fabrication performance. It can be supplied in the solution-treated Condition A or aged to meet specified mechanical properties.
For a quotation, specify the grade, product standard, dimensions, supply condition, tolerances, testing and delivery destination.
At a glance
Custom 450 Round Bar quick facts
- Product
- Custom 450 Round Bar
- Material category
- Specialty Round Bars
- Product reference
- Custom 450 Round Bar
- Standards and designations referenced
- UNS S45000 · ASTM A564/A564M (bar)
- Enquiry details
- Grade, dimensions and supply condition
Confirm the applicable specification and availability for your required size and condition.
Material selection
How to Specify Custom 450 Round Bar
Identify UNS S45000, the required product specification, diameter, length and material condition. For precipitation-hardening stainless steels, the condition is important because strength and ductility change after aging.
Applications
Where Is Custom 450 Round Bar Used?
Custom 450 can be considered for machined parts requiring higher strength than conventional austenitic stainless steels while retaining useful corrosion resistance. Suitability depends on the environment, loading and heat treatment.
Typical application areas include aerospace components, pump and valve parts, chemical-processing equipment, power-generation components, shafts and fasteners, and equipment for the pulp-and-paper industry. Engineering approval is required for pressure-retaining or safety-critical components.
For a different balance of corrosion performance and strength, buyers can also review Duplex Steel Round Bar and Stainless Steel Round Bar.
Standards and supply
Custom 450 Round Bar Standards and Supply Conditions
ASTM A564/A564M is a commonly referenced specification for this age-hardening stainless bar. The specified heat-treatment condition and test requirements must be agreed before supply.
| Item | Guidance |
|---|---|
| Primary alloy designation | Custom 450 / UNS S45000 |
| Bar specification | ASTM A564/A564M – hot-rolled and cold-finished age-hardening stainless steel bars and shapes; verify the latest applicable edition |
| Other references | AMS requirements may apply to particular aerospace product forms; confirm the exact AMS specification on the purchase order |
| Supply condition | Solution treated / annealed (Condition A), or a specified precipitation-hardened condition |
| Forms and finishing | Round bars, turned, peeled, ground or polished as agreed; availability depends on size and order |
| Test documentation | Chemical analysis, mechanical test results and traceability according to the order |
Do not use broad size or ready-stock claims without confirming actual inventory. Ask for the available bar diameter and length in the required condition.
Alloy chemistry
Chemical Composition of Custom 450 (UNS S45000)
Custom 450 contains chromium and nickel for corrosion performance, with copper and other elements contributing to its age-hardening response. The table below follows the alloy manufacturer’s published type analysis; the purchase specification and material test certificate govern actual acceptance.
| Element | Custom 450 typical specification (wt. %) |
|---|---|
| Chromium (Cr) | 14.00–16.00 |
| Nickel (Ni) | 5.00–7.00 |
| Copper (Cu) | 1.25–1.75 |
| Molybdenum (Mo) | 0.50–1.00 |
| Carbon (C) | 0.05 max |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.030 max |
| Sulfur (S) | 0.030 max |
| Niobium / columbium (Nb/Cb) | At least 8 × carbon content |
| Iron (Fe) | Balance |
Composition figures are weight percentages, not a guarantee for every heat. Refer to the material test certificate for the supplied bar.
Mechanical performance
Mechanical Properties and Heat-Treatment Conditions
Strength, hardness, toughness and ductility are not single fixed values for Custom 450. They change with aging temperature, bar size and the specification being used. The annealed material can be machined before a final age-hardening step when required.
| Condition | Heat treatment or general outcome |
|---|---|
| Condition A | Solution-treated / annealed; commonly used for further machining or subsequent aging |
| H900 | Aged at approximately 900°F (482°C); higher strength, with condition-dependent ductility |
| H950 | Aged at approximately 950°F (510°C) |
| H1000 | Aged at approximately 1000°F (538°C) |
| H1050 | Aged at approximately 1050°F (566°C) |
| H1150 | Aged at approximately 1150°F (621°C); typically lower strength and greater ductility than lower aging temperatures |
Important: The H900–H1150 labels describe aging conditions, not guaranteed strength values. Obtain the required minimum tensile strength, yield strength, elongation and hardness from the governing specification and test certificate.
Grade comparison
What Makes Custom 450 Different from Other Stainless Steels?
Custom 450 is a martensitic age-hardenable stainless steel. Unlike conventional austenitic grades, it can gain strength through a controlled aging treatment after solution treatment. Its manufacturer describes corrosion resistance broadly comparable to Type 304 in many environments, but this does not make it suitable for every chloride or chemical service.
| Material | Key selection difference |
|---|---|
| Custom 450 (S45000) | Martensitic age-hardenable; corrosion resistance and strength balance; properties depend on aging |
| Stainless Steel 304 | Austenitic; widely used for general corrosion resistance; not precipitation hardened like Custom 450 |
| Duplex Steel 2205 | Duplex microstructure; commonly considered for higher chloride resistance and strength in suitable service |
For finishing and machining routes, see Bright Round Bar and Round Bar.
Material identification
Custom 450 Designations and Ordering Notes
| Designation | Details |
|---|---|
| Commercial name | Custom 450® stainless steel |
| UNS designation | S45000 |
| Bar specification | ASTM A564/A564M, subject to edition and order requirements |
| Heat treatment | Condition A or specified aged condition |
The material name and UNS number identify the alloy. Do not treat another commercial alloy, stainless grade or Werkstoff number as interchangeable without confirming chemistry, mechanical properties and governing standards.
For certificates, inspection and traceability, see Quality Assurance. For dimensions and a quotation, contact the team.
Product questions
Custom 450 Round Bar FAQs
What is Custom 450 Round Bar?
Custom 450 is a martensitic, age-hardenable stainless steel designated UNS S45000. It combines corrosion resistance, strength and machinability for suitably specified industrial components.
Which ASTM standard applies to Custom 450 round bars?
ASTM A564/A564M is commonly used for age-hardening stainless steel bars. Check the required edition, dimensions, heat treatment and acceptance criteria on the order.
What is the difference between Condition A and H900?
Condition A is the solution-treated or annealed state. H900 is an aged condition, generally selected for increased strength. Actual properties depend on the product specification and size.
Is Custom 450 similar to Stainless Steel 304?
Its corrosion resistance can be broadly similar to 304 in many environments, but Custom 450 has a different microstructure and can be precipitation hardened. Material selection still depends on the service conditions.
Can Custom 450 round bars be machined and welded?
Yes, Custom 450 is known for useful machinability and weldability. Fabrication and any post-fabrication aging requirements should follow the approved procedure.
What information is needed for a Custom 450 bar quotation?
Provide UNS S45000, ASTM or other governing specification, diameter, length, quantity, heat-treatment condition, finish, inspection documents and delivery destination.