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ASTM A672 steel pipe is widely used for high-pressure service at moderate temperatures. Within this specification, grades C60, C65, and C70 represent increasing strength levels. C60 offers moderate strength, C65 provides an intermediate balance, and C70 delivers the highest load-bearing capacity.
However, selecting the right grade requires more than comparing strength numbers. Engineers must also evaluate toughness, chemical composition, weldability, and heat treatment requirements. Furthermore, the pipe's pressure capacity depends on multiple factors, including outside diameter, wall thickness, operating temperature, and applicable design codes. A higher-strength grade is not automatically the best choice for every application.
What Is ASTM A672 Steel Pipe?
ASTM A672 steel pipe is an electric-fusion-welded steel pipe made from pressure-vessel-quality plate and designed for high-pressure service at moderate temperatures. It is commonly used in power plants, oil and gas facilities, refineries, petrochemical plants, and other industrial piping systems where reliable pressure performance is required.
Key Features
Feature | Description |
|---|---|
Manufacturing | Electric-fusion-welded—plate formed into cylinder, edges joined by welding |
Starting Material | Pressure-vessel-quality plate |
Service | High-pressure at moderate temperatures |
Grades & Classes | Material grade (plate type) + class (manufacturing, heat treatment, testing, inspection) |
Heat Treatment | May be applied after welding per grade and class |
Testing | Chemical analysis, tensile, hydrostatic, weld examination, NDT |
Suitable For | Large-diameter industrial piping and pressure systems |
ASTM A672 Grade and Class – Important Note
Requirement | Action |
|---|---|
Grade | Identifies plate material—C60, C65, C70 represent different strength levels (verify against specification) |
Class | Defines manufacturing, heat treatment, testing, inspection |
Complete designation | Specify both grade and class—not just "A672 pipe" |
Mechanical properties | Verify against applicable ASTM specification—do not assume from designation alone |
Key Properties
Property | Benefit |
|---|---|
Electric-fusion-welded construction | Reliable welded pipe |
Pressure-vessel-quality plate | Controlled material basis |
High-pressure capability | Suitable for demanding pressure systems |
Grade and class options | Flexibility for different requirements |
Controlled heat treatment and testing | Quality assurance |
Wide range of sizes and wall thicknesses | Adaptable to project needs |
Common Applications
Application | Typical Use |
|---|---|
Power-generation facilities | High-pressure utility and process piping |
Oil and gas processing plants | Process systems |
Refineries | Pressure piping |
Petrochemical facilities | Industrial process piping |
Industrial process piping | Moderate temperature, high pressure |
Pressure piping systems | Reliable pressure performance |
Large-diameter industrial pipelines | High-capacity transport |
Selection Factors
Factor | Why It Matters |
|---|---|
Operating pressure | Determines grade and wall thickness |
Operating temperature | Moderate temperature service |
Pipe diameter | Large-diameter capability |
Wall thickness | Pressure capacity |
Toughness | Impact requirements |
Welding requirements | Field and shop fabrication |
Applicable design codes | Compliance |
Key Takeaway
ASTM A672 steel pipe is a practical solution for high-pressure piping where:
Electric-fusion-welded construction is suitable
Pressure-vessel-quality plate is appropriate
Selecting the correct grade and class ensures the pipe meets the project's mechanical, testing, and inspection requirements.
ASTM A672 C60, C65, and C70: Grade Overvie
ASTM A672 steel pipe is available in different material grades and classes to meet various pressure-piping requirements. When comparing C60, C65, and C70, the main point to understand is that they represent different strength levels within the applicable material designation. In general, the strength level increases from C60 to C65 and then to C70.
Grade Comparison
Feature | C60 | C65 | C70 |
|---|---|---|---|
Relative Strength | Lower | Intermediate | Higher |
Typical Selection | Moderate-strength requirements | Balanced strength requirements | Higher-strength requirements |
Welded Construction | Yes | Yes | Yes |
Pressure-Piping Use | Possible | Possible | Possible |
Best Selection Factor | Sufficient design strength | Balance of requirements | Higher required strength |
ASTM A672 C60
Aspect | Details |
|---|---|
Strength Level | Lower compared with C65 and C70 |
Best For | Moderate-strength pressure-piping applications |
Advantages | Adequate strength for general use, good weldability, practical fabrication, potential cost savings |
Key Point | Do not select based on grade name alone—review complete designation, wall thickness, operating conditions, design code |
ASTM A672 C65
Aspect | Details |
|---|---|
Strength Level | Intermediate between C60 and C70 |
Best For | When more strength than C60 is required, but not the highest level |
Advantages | Higher strength than C60, balance of strength and fabrication, additional design capacity |
Key Point | Evaluate chemical composition, toughness, weldability, heat treatment, and testing before purchase |
ASTM A672 C70
Aspect | Details |
|---|---|
Strength Level | Higher strength among the three grades |
Best For | Demanding designs benefiting from increased strength, or when specified by project |
Advantages | Higher specified strength, greater strength potential for demanding applications |
Key Point | Higher strength ≠ automatically better—review welding procedures, heat input, preheating, consumables, post-weld requirements |
Important Notes
Consideration | Action |
|---|---|
C70 is not automatically the best choice | Higher strength without necessity increases material and fabrication costs |
Grade selection factors | Design pressure, operating temperature, pipe dimensions, mechanical properties, toughness, welding procedure, inspection, design codes |
Complete designation | Review the full ASTM A672 specification—not just the grade name |
Key Takeaway
C60 – suitable when moderate strength is sufficient
C65 – intermediate option when more strength is needed
C70 – appropriate when higher strength is required
Final selection should always be based on the complete ASTM designation and the project's technical requirements.
ASTM A672 C60 vs. C65 vs. C70: Key Performance Differences
ASTM A672 steel pipes made from Grade 60, Grade 65, and Grade 70 pressure-vessel-quality plate offer different levels of mechanical strength. In general, Grade 60 provides the lowest strength level, Grade 65 provides an intermediate level, and Grade 70 provides the highest. The exact pipe requirements, however, depend on the complete ASTM A672 designation and the applicable plate specification.
Strength Comparison (ASTM A515 Plate Grades)
Plate Grade | Tensile Strength | Minimum Yield Strength |
|---|---|---|
Grade 60 | 60–80 ksi (415–550 MPa) | 32 ksi (220 MPa) |
Grade 65 | 65–85 ksi (450–585 MPa) | 35 ksi (240 MPa) |
Grade 70 | 70–90 ksi (485–620 MPa) | 38 ksi (260 MPa) |
Key Performance Differences
Factor | C60 | C65 | C70 |
|---|---|---|---|
Strength Level | Lowest | Intermediate | Highest |
Tensile Strength | 60–80 ksi | 65–85 ksi | 70–90 ksi |
Minimum Yield | 32 ksi (220 MPa) | 35 ksi (240 MPa) | 38 ksi (260 MPa) |
Minimum Elongation (2") | 25% | 23% | 21% |
Toughness/Ductility | Higher | Intermediate | Lower |
Weldability | Good | Requires attention | Greater attention needed |
Best For | Moderate strength requirements | Balanced strength requirements | Higher strength requirements |
Key Considerations
Factor | Why It Matters |
|---|---|
Tensile and Yield Strength | C60 (lowest) → C65 (intermediate) → C70 (highest)—pressure capacity also depends on OD, wall thickness, pressure, temperature, allowable stress, and design code |
Toughness and Ductility | Higher strength = lower elongation (25% → 23% → 21%)—evaluate complete mechanical properties |
Weldability | Higher grades require greater attention to welding parameters and procedure qualification—do not assume identical fabrication requirements |
Heat Treatment and Testing | Grade + class must be considered together—different classes = different manufacturing, inspection, and testing requirements |
Which Grade Performs Best?
Condition | Recommended Grade |
|---|---|
Strength meets design requirements | Grade 60 |
Higher intermediate strength needed | Grade 65 |
Higher specified strength required | Grade 70 |
Which ASTM A672 Grade Should You Choose?
Choosing between ASTM A672 Grade 60, Grade 65, and Grade 70 depends on the actual design requirements of the piping system. There is no single grade that is best for every application. The right choice should provide sufficient strength and toughness while also meeting welding, testing, temperature, pressure, and cost requirements.
Quick Selection Guide
Condition | Recommended Grade |
|---|---|
Moderate strength sufficient | Grade 60 |
Balance of strength and cost | Grade 65 |
Higher strength required | Grade 70 |
Choose Grade 60 When Moderate Strength Is Sufficient
Aspect | Details |
|---|---|
Best For | General pressure-piping applications where design does not require higher strength |
Advantage | Cost-effective—no benefit in higher grade if not needed |
Key Point | Select when Grade 60 fully satisfies engineering requirements |
Choose Grade 65 for a Balanced Option
Aspect | Details |
|---|---|
Best For | When Grade 60 is insufficient, but Grade 70 is unnecessary |
Advantage | Balance between strength, fabrication requirements, and material cost |
Key Point | Check mechanical properties against referenced plate specification and complete A672 designation |
Choose Grade 70 When Higher Strength Is Required
Aspect | Details |
|---|---|
Best For | Higher-load or more demanding pressure-piping designs |
Advantage | Higher specified strength—tensile range 70–90 ksi (485–620 MPa) |
Key Point | Higher strength ≠ automatically better—consider welding, heat treatment, toughness, inspection, project specs |
Key Factors Before Selection
Factor | Why It Matters |
|---|---|
Design pressure | Selected material and dimensions must meet pressure rating |
Operating temperature | Material suitability for actual service temperature |
Pipe size and wall thickness | Pressure capacity depends on dimensions + material strength |
Mechanical properties | Yield and tensile properties vs. selected grade |
Toughness | Impact requirements where applicable |
Weldability | Welding procedure and qualification requirements |
Heat treatment | Required A672 class and associated heat treatment |
Inspection | Radiographic, hydrostatic, and other NDT requirements |
Design code | Compliance with ASME, API, or project specification |
Which Grade Is Best?
Rule | Action |
|---|---|
Select the lowest grade that fully satisfies engineering requirements | Grade 60 for moderate strength; Grade 65 for intermediate; Grade 70 when higher strength is necessary |
Do not choose Grade 70 just because it has the highest strength | May increase cost without benefit |
Do not choose lower grade when design requires higher strength | Creates compliance and safety problems |
Key Takeaway
Decision should be based on the complete ASTM A672 grade and class, referenced plate specification, operating conditions, pipe dimensions, testing requirements, and applicable design code.
Providing these details to the supplier ensures the correct pipe recommendation.
ASTM A672 C60, C65, and C70 Applications
ASTM A672 steel pipe is designed for high-pressure service at moderate temperatures and is manufactured by electric-fusion welding pressure-vessel-quality plate. The standard covers several material grades and classes, so the exact application depends on the complete designation, pipe dimensions, operating conditions, and project requirements.
Grade Overview
Grade | Strength Level | Tensile Range (ASTM A515) | Best For |
|---|---|---|---|
C60 | Moderate | 60–80 ksi (415–550 MPa) | Moderate-strength pressure-piping applications |
C65 | Intermediate | 65–85 ksi (450–585 MPa) | Balanced strength requirements |
C70 | High | 70–90 ksi (485–620 MPa) | Higher-strength pressure-piping applications |
Applications by Grade
Application | C60 | C65 | C70 |
|---|---|---|---|
Industrial pressure piping | ✓ | ✓ | ✓ |
Power-generation facilities | ✓ | ✓ | ✓ |
Oil and gas processing | ✓ | ✓ | ✓ |
Refineries | ✓ | ✓ | ✓ |
Petrochemical plants | ✓ | ✓ | ✓ |
Large-diameter process piping | ✓ | ✓ | ✓ |
High-pressure industrial piping | — | ✓ | ✓ |
Heavy-duty industrial pressure systems | — | — | ✓ |
General pressure-service pipelines | ✓ | ✓ | ✓ |
When to Choose Each Grade
Grade | When to Choose |
|---|---|
C60 | Adequate strength and cost efficiency are priorities—design does not require higher strength |
C65 | Intermediate strength level—when more strength than C60 is needed but C70 is unnecessary |
C70 | Higher strength required—demanding high-pressure or heavy-duty systems |
Important Note – Class Selection
Consideration | Action |
|---|---|
A672 class identifies manufacturing requirements | Heat treatment, radiographic examination of weld, pressure testing |
Grade + class must be specified together | Complete designation—not just grade name |
Key Takeaway
C60 – suitable when moderate strength is sufficient
C65 – intermediate strength option
C70 – appropriate when higher strength is required
The best grade is not necessarily the strongest one—it is the grade that fully satisfies engineering requirements while providing practical fabrication, inspection, and cost performance. Selection should be based on design pressure, operating temperature, pipe diameter, wall thickness, mechanical properties, toughness, welding requirements, and applicable codes.
Our ASTM A672 Steel Pipe Products & Shipping Services
We supply premium ASTM A672 electric-fusion-welded steel pipes, engineered for high-pressure service at moderate temperatures in power generation and petrochemical applications. We customize our pipes to your exact Grade 60, 65, or 70 specifications and required classes.
Quality and compliance are paramount. We conduct rigorous inspections—including hydrostatic testing, NDT, and heat-treatment verification—and provide comprehensive Mill Test Certificates (MTCs) to guarantee full adherence to ASTM A672 standards.
Beyond manufacturing, we provide end-to-end global shipping solutions. We understand that timely delivery is critical to maintaining project schedules. Our logistics team manages secure packaging and flexible transportation options (container and bulk freight) to prevent transit damage and ensure your pipes arrive safely and on time.
To receive a customized product and shipping quotation, please contact us today with your required grade, class, dimensions, testing requirements, quantity, and delivery destination. Our expert team will recommend the optimal high-pressure steel pipe configuration tailored to your exact needs.
Conclusion
ASTM A672 steel pipe is widely used for high-pressure, moderate-temperature applications in power generation and petrochemical industries. Available in Grades 60, 65, and 70, each offers different strength levels to meet specific engineering needs.
However, the highest grade is not always the best choice. Proper material selection requires evaluating design pressure, operating temperature, wall thickness, and applicable design codes. The complete A672 designation, including the specific pipe class, must be reviewed to ensure weldability, toughness, and compliance.
FAQ：
1. What is the difference between ASTM A672 C60, C65, and C70?
They represent different material strength levels. In general, Grade 60 has the lowest specified strength, Grade 65 is intermediate, and Grade 70 has the highest. The exact properties depend on the referenced plate specification.
2. Which is stronger, ASTM A672 C60 or C70?
Grade 70 is stronger than Grade 60 in terms of specified tensile and yield strength. However, the complete ASTM A672 designation and referenced plate standard should be checked for exact values.
3. Is ASTM A672 C70 better than C60?
Not necessarily. C70 is preferable when higher strength is required, while C60 may be more economical when its mechanical properties are sufficient for the application.
4. Can ASTM A672 C60, C65, and C70 be used interchangeably?
No. Substitution should be evaluated based on strength, toughness, dimensions, operating conditions, welding requirements, applicable codes, and project specifications.
5. What is ASTM A672 steel pipe used for?
ASTM A672 pipe is commonly used for high-pressure service at moderate temperatures, including applications in power plants, oil and gas facilities, refineries, petrochemical plants, and industrial process piping.
