Recommend Products
Name: Fujian Monel 400 Double End Stud Material: Monel 400 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: Resistant to hydrofluoric acidQS Fastener: Monel 400 Double End Stud
Name: Inconel 625 Double End Stud Material: Inconel 625 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 625 Double End Stud
Name: Xiamen Inconel 600 High Strength Fastener Material: Inconel 600 Standard: ASME Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 High Strength Fastener
Name: Inconel 600 Stud Bolt Putian Material: Inconel 600 Standard: ASME B18.2.1 Size: 5/16 to 4 inch Length: 30 to 1000 mm Class: 12.9 Feature: High Yield Strength, Durable Strength and Corrosion ResistanceQS Fastener: Inconel 600 Stud Bolt
A193 B7 Screw China Supplier
QS Fastener: A193 B7 Screw China Supplier
Name: A193 B7 Screw China Supplier
Standard: ASTM
Material: A193 B7
Size: 1/2 to 4 inch
Thread: 4-1/2 UNC
Length: 30 to 1000 mm
Grade: A
Price: USD 2.99 - 9.99/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Standard: ASTM
Material: A193 B7
Size: 1/2 to 4 inch
Thread: 4-1/2 UNC
Length: 30 to 1000 mm
Grade: A
Price: USD 2.99 - 9.99/ Kg
MOQ: 10kg
Customization: yes
Delivery time: 7-30 Day
Application: Oil Pipeline, Machinery, Chemical Industry, Building
Quantity
The ASTM A193 B7 Screw is a high-strength fastener engineered for demanding service conditions, including high-temperature and high-pressure environments. Manufactured from chromium-molybdenum alloy steel, this screw delivers excellent corrosion resistance and mechanical reliability, making it a preferred choice across oil pipeline systems, heavy machinery, chemical processing plants, and structural building projects. Available in diameters from 1/2 to 4 inches, lengths ranging 30 to 1000 mm, and featuring 4-1/2 UNC threads, the Grade A classification ensures consistent conformity to ASTM stringent requirements. When sourcing from a trusted China supplier, buyers benefit from rigorous process control and full material traceability, which are essential for critical bolting applications.
To guarantee that every batch meets ASTM A193 specifications, our production incorporates a multi-stage inspection regimen. Chemical composition is verified using optical emission spectrometry (OES) and ICP, confirming key element ranges – chromium 0.80%–1.10%, molybdenum 0.15%–0.25%, carbon 0.37%–0.49%, manganese 0.65%–1.10%, and silicon 0.15%–0.35%, in line with ASTM A751. Mechanical performance is assessed through tensile testing per ASTM E8, requiring tensile strength ≥862 MPa, yield ≥724 MPa, and elongation ≥16%, while Charpy V-notch impact tests at -18°C per ASTM E23 ensure toughness values ≥20 J. Metallographic examination, following ASTM E112, confirms a tempered martensite or bainite structure with grain size 5–8, free from inclusions or voids. Hardness is measured on the Rockwell or Brinell scale per ASTM E18/E10, targeting HRC 26–32 or HB 269–341. Non-destructive testing, including ultrasonic (ASTM E2375) and magnetic particle (ASTM E1444) methods, screens for subsurface and surface discontinuities. Heat treatment verification – quenching at 850°C–900°C and tempering at 550°C–650°C – ensures uniform hardness distribution and optimal mechanical properties.
Partnering with a capable China supplier not only streamlines logistics but also provides access to comprehensive test reports and certified mill records. For engineers and procurement professionals, selecting a qualified China supplier for the A193 B7 Screw translates into predictable performance, reduced project risks, and long-term service integrity in critical bolted connections. Our commitment to these thorough inspection protocols reinforces product dependability, meeting both domestic and international project demands with confidence.
FAQ:
Q1: What is the difference between Grade A and Grade B in ASTM A193?
A: Under ASTM A193,"Grade"indicates material type and heat-treatment condition, not an A/B quality tier. Grade B7 is the most common quench-and-tempered alloy steel grade; Grade B8 is austenitic stainless steel. The"A"in your description refers to the product classification within the supply system – it does not imply a lower or higher grade than B7.
A: Under ASTM A193,"Grade"indicates material type and heat-treatment condition, not an A/B quality tier. Grade B7 is the most common quench-and-tempered alloy steel grade; Grade B8 is austenitic stainless steel. The"A"in your description refers to the product classification within the supply system – it does not imply a lower or higher grade than B7.
Send Message
