ALLOY & CARBON STEELS
Alloy & Carbon Steels for Critical Industrial Applications
MillsForge supplies carbon and alloy steels for pressure-containing, high-temperature, low-temperature, and demanding industrial applications, with material sourcing, manufacturing coordination, machining, inspection, documentation, and international delivery managed according to project requirements.
A105 · A350 · A694 · A182 Grades · A193 · A320
MATERIAL GRADES
Carbon & Alloy Steel Grades We Supply
Carbon Steel Forgings
ASTM A105 / A105M
Carbon steel forgings for piping applications, including flanges, fittings, valves, and similar pressure-system components within the scope of the applicable specification.
Low-Temperature Carbon & Alloy Steels
ASTM A350 / A350M
Typical grades may include:
LF2 · LF3 · Other Applicable Grades
Carbon and low-alloy steel forgings requiring notch-toughness testing for low-temperature piping applications.
High-Strength Carbon & Alloy Steel Forgings
ASTM A694 / A694M
Common grades include:
F42 · F46 · F52 · F56 · F60 · F65 · F70
High-strength carbon and alloy steel forgings for pipe flanges, fittings, valves, and pressure-transmission service.
Alloy Steel Forgings
ASTM A182 / A182M Alloy Grades
Typical grades:
F5 · F9 · F11 · F22 · F91
Alloy steel forgings selected for pressure systems and elevated-temperature service according to material grade and application requirements.
MATERIAL SELECTION
Steel Grades for Different Service Conditions
| Material | Typical Grade | Service Positioning |
| ASTM A105 | A105 | General carbon steel piping forgings |
| ASTM A350 | LF2 / LF3 | Low-temperature service |
| ASTM A694 | F42–F70 | High-strength pressure transmission |
| ASTM A182 | F5 / F9 / F11 / F22 / F91 | Alloy steel / elevated-temperature service |
| ASTM A193 | B7 / B7M / B16 | High-pressure / high-temperature bolting |
| ASTM A320 | L7 / L7M | Low-temperature bolting |
Material selection should be based on design temperature, pressure, mechanical requirements, toughness, corrosion environment, welding requirements, heat treatment, and applicable project specifications.
PRODUCT FORMS
Alloy & Carbon Steels 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
STANDARDS & SPECIFICATIONS
Carbon & Alloy Steels to Applicable Standards
Forgings & Flanges
ASTM A105 / A105M
ASTM A350 / A350M
ASTM A694 / A694M
ASTM A182 / A182M
Fittings
ASTM A234 / A234M
ASTM A420 / A420M
Bolting
ASTM A193 / A193M
ASTM A320 / A320M
ASTM A194 / A194M
Additional Requirements
ASME · EN · DIN · ISO · Customer Specifications
Applicable specifications depend on material grade, product form, dimensions, heat treatment, service conditions, and project requirements.
HIGH-TEMPERATURE SERVICE
Cr-Mo Alloy Steels for Elevated-Temperature Applications
Chromium-molybdenum and chromium-molybdenum-vanadium alloy steels are widely used in pressure equipment, power generation, petrochemical, and high-temperature piping systems where elevated-temperature strength is required.
ASTM A182 F11 · ASTM A182 F22 · ASTM A182 F91
Selection of alloy steel grade, heat treatment, mechanical properties, and testing requirements should be based on the applicable design code, material specification, and service conditions.
LOW-TEMPERATURE SERVICE
Carbon & Alloy Steels for Low-Temperature Applications
Low-temperature applications may require materials with specified notch toughness and impact properties. ASTM A350 grades are commonly specified for forged piping components, while ASTM A320 grades are used for bolting in low-temperature service.
A350 LF2 · A350 LF3 · A320 L7 · A320 L7M
Impact-test temperature, mechanical properties, heat treatment, and acceptance criteria should be confirmed against the applicable material and project specification.
BOLTING MATERIALS
Alloy Steel Bolting for Pressure Applications
ASTM A193: B7 · B7M · B16
Alloy steel bolting materials for high-temperature, high-pressure, and other special-purpose applications.
ASTM A320: L7 · L7M
Alloy steel bolting materials for low-temperature service.
ASTM A194: 2H · 2HM · 4 · 7 · 7M · Applicable Grades
Nut grades are selected according to the specified bolting material, service condition, and applicable standard.
INSPECTION & TESTING
Testing for Carbon & Alloy Steel Components
Mechanical Testing
Tensile · Yield · Elongation · Hardness
Mechanical testing can be performed according to applicable material and project specifications.
Impact Testing
Charpy V-Notch
Impact testing can be coordinated where required, including specified test temperatures and acceptance criteria.
NDT
UT · MT · PT · RT Where Applicable
Non-destructive examination can be coordinated according to product form, applicable specification, and project requirements.
Bolting Tests
Proof Load · Tensile · Hardness
Fastener testing can be coordinated according to applicable bolting specifications and project requirements.
QUALITY & COMPLIANCE
Material Traceability & Documentation
Material Traceability: Heat Number · Material Identification · Product Marking
Inspection Reports: Dimensional · Mechanical · Impact · NDT · Applicable Test Reports
Material Certification: EN 10204 3.1 / 3.2
Third-Party Inspection: Independent third-party inspection can be coordinated according to project requirements.
APPLICATIONS
Carbon & Alloy Steels for Industrial Service
Oil & Gas
Petrochemical
Power Generation
Pressure Equipment
Pipelines & Piping Systems
Industrial Equipment
Carbon and alloy steel selection depends on operating pressure, temperature, strength, toughness, heat treatment, fabrication requirements, and applicable design and material specifications.
MATERIAL KNOWLEDGE
Understand Carbon & Alloy Steel Specifications
ASTM A105 vs A350 LF2
Understand when general-service carbon steel or low-temperature carbon steel forgings may be specified.
ASTM A105 vs A694
Compare general carbon steel forgings with high-strength pressure-transmission grades.
ASTM A193 B7 vs B7M
Compare two widely specified alloy steel bolting grades and their service considerations.
ASTM A193 B7 vs B16
Understand the differences between common high-temperature bolting grades.
CARBON & ALLOY STEEL REQUIREMENTS
Looking for a Specific Carbon or Alloy Steel Grade?
Send us the material grade, product form, dimensions, quantity, applicable specification, heat treatment, inspection and testing 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 · Heat Treatment · Inspection