STAINLESS STEELS
Stainless Steel Materials & Components for Industrial Applications
MillsForge supplies stainless steels for corrosion-resistant, high-temperature, pressure-containing, and demanding industrial applications, with material sourcing, manufacturing coordination, machining, inspection, documentation, and international delivery managed according to project requirements.
304/304L · 316/316L · 321 · 347/347H · 904L
STAINLESS STEEL GRADES
Stainless Steel Grades We Supply
304 / 304L
UNS S30400 / S30403
Widely used austenitic stainless steels offering a practical combination of corrosion resistance, fabrication characteristics, and mechanical properties for general industrial applications.
316 / 316L
UNS S31600 / S31603
Molybdenum-bearing austenitic stainless steels offering improved resistance to many corrosive environments compared with conventional 304 grades.
321
UNS S32100
Titanium-stabilized austenitic stainless steel selected for applications involving elevated temperatures and resistance to intergranular corrosion after exposure to sensitizing temperatures.
347 / 347H
UNS S34700 / S34709
Niobium-stabilized austenitic stainless steels used in elevated-temperature service where resistance to intergranular corrosion and thermal stability are important.
904L
UNS N08904
High-alloy austenitic stainless steel containing nickel and molybdenum for enhanced corrosion resistance in demanding chemical and process environments.
GRADE SELECTION
Selecting the Right Stainless Steel Grade
| Grade | UNS | Key Characteristic | Typical Positioning |
| 304L | S30403 | General corrosion resistance | General industrial service |
| 316L | S31603 | Mo-enhanced corrosion resistance | Chemical/process environments |
| 321 | S32100 | Titanium stabilized | Elevated-temperature service |
| 347/347H | S34700/S34709 | Niobium stabilized | Elevated-temperature components |
| 904L | N08904 | High Ni/Mo alloying | More aggressive corrosive service |
Final material selection should consider operating temperature, corrosion environment, pressure, fabrication method, mechanical requirements, and applicable material specifications.
PRODUCT FORMS
Stainless Steel in the Forms Your Project Requires
Rings · Discs · Blocks · Shafts · Custom Shapes
WN · Blind · SO · LJ · Threaded · Custom
BW · SW · Threaded · Custom Fittings
Round Bars · Hollow Bars · Flat Bars
Stud Bolts · Bolts · Nuts · Custom Fasteners
Drawing-Based · Machined · Made-to-Order
MATERIAL PERFORMANCE
Why Stainless Steel?
Corrosion Resistance
Stainless steels provide a broad range of corrosion resistance depending on alloy composition, environment, temperature, and service conditions.
Temperature Capability
Stabilized and high-carbon grades such as 321 and 347H can be selected for specific elevated-temperature applications.
Fabrication & Machining
Stainless steels are available in multiple product forms suitable for forging, machining, welding, and component manufacturing.
Broad Grade Selection
Different alloy families allow material selection to be matched to corrosion, temperature, strength, fabrication, and project requirements.
STANDARDS & SPECIFICATIONS
Stainless Steel to Applicable Material Standards
Bars & Rods
ASTM A276 / A276M
Stainless steel bars and shapes in applicable grades and conditions.
Forgings & Flanges
ASTM A182 / A182M
Common grades include:
F304 · F304L · F316 · F316L · F321 · F347
Fittings
ASTM A403 / A403M
Wrought austenitic stainless steel piping fittings.
Plate / Sheet / Strip
ASTM A240 / A240M
Stainless steel plate, sheet, and strip in applicable grades.
Pipes
ASTM A312 / A312M
Seamless, welded, and heavily cold-worked austenitic stainless steel pipe.
Applicable specifications depend on material grade, product form, dimensions, supply condition, and project requirements.
HIGH-TEMPERATURE GRADES
321 & 347H for Elevated-Temperature Service
Stabilized stainless steels such as 321 and 347 are used where elevated-temperature exposure and resistance to intergranular corrosion are important. Grade 347H provides controlled higher carbon content for applications requiring improved high-temperature strength.
321: Titanium Stabilized
347: Niobium Stabilized
347H: Higher-Carbon 347 Grade for Elevated-Temperature Service
Material selection and product specifications should be reviewed against the actual design temperature, service conditions, fabrication route, and applicable code requirements.
INSPECTION & TESTING
Testing for Stainless Steel Materials & Components
PMI
Positive Material Identification
Material chemistry can be verified according to inspection and project requirements.
Mechanical Testing
Tensile · Yield · Elongation · Hardness
Mechanical properties can be tested according to applicable material specifications.
NDT
UT · PT · MT Where Applicable · RT Where Applicable
Non-destructive examination can be coordinated according to product form, material, applicable standard, and project requirements.
Additional Testing
Impact · Corrosion · Intergranular Corrosion · Project-Specified Testing
Additional testing can be coordinated where required by the applicable specification or customer requirements.
QUALITY & COMPLIANCE
Material Traceability & Documentation
Heat Traceability: Heat number and material identification maintained according to order requirements.
Inspection Reports: Dimensional, PMI, NDT, mechanical, corrosion, and other applicable inspection records.
Material Certification: EN 10204 3.1 / 3.2
Third-Party Inspection: Independent inspection by recognized third-party organizations can be coordinated when required.
APPLICATIONS
Stainless Steel for Industrial Applications
Chemical & Petrochemical
Oil & Gas
Power Generation
Process Equipment
Valves & Pumps
Industrial Equipment
Stainless steel grade selection depends on corrosion environment, operating temperature, pressure, fabrication requirements, mechanical properties, and applicable project specifications.
MATERIAL KNOWLEDGE
Compare Stainless Steel Grades
304L vs 316L
Compare alloy composition, corrosion resistance, cost considerations, and typical industrial applications.
316L vs 904L
Understand when higher-alloy 904L may be considered for more demanding corrosive environments.
321 vs 347
Compare two stabilized austenitic stainless steels for elevated-temperature applications.
347 vs 347H
Understand the role of carbon content and high-temperature strength in 347H stainless steel.
STAINLESS STEEL REQUIREMENTS
Looking for a Specific Stainless Steel Grade?
Send us the material grade, product form, dimensions, quantity, applicable specification, inspection requirements, and delivery destination. We will review your requirement and coordinate a suitable supply solution.
What to include in your RFQ:
Grade · Product Form · Size · Quantity · Standard · Inspection