Along with the years of entrepreneurial journey of Zhongyuan people, she gradually formed her own spiritual pillar and behavioral norms. In the silent inheritance, she guided Zhongyuan Company towards a more brilliant tomorrow.
ASTM A333 Grade 9
keyword ASTM A333 Grade 9 Category Steel pipe material Related products Get a quoteChemical and mechanical properties of ASTM A333 Grade 9 spiral steel pipes
1、 Chemical composition
Main elements
Carbon (C): ≤ 0.15% (to control cold brittleness and improve high-temperature stability).
Manganese (Mn): 0.30%~0.60% (enhances matrix strength).
Silicon (Si): 0.25%~1.00% (deoxygenation and improved oxidation resistance).
Phosphorus (P) and sulfur (S): both ≤ 0.025% (strictly limit impurity content).
Alloy elements
Chromium (Cr): 8.00%~10.00% (enhances high-temperature oxidation resistance).
Molybdenum (Mo): 0.90%~1.10% (enhances creep strength and heat resistance).
2、 Mechanical performance
Strength and plasticity
Tensile strength (Rm): ≥ 415 MPa (meets high temperature and pressure requirements).
Yield strength (Rp0.2): ≥ 205 MPa (ensuring structural stability under high temperature conditions).
Elongation rate (δ%): ≥ 30% (good plastic deformation ability).
High temperature performance
Applicable temperature: 550 ℃~600 ℃ (suitable for high temperature and high pressure environments).
Antioxidant properties: Excellent (corrosion and oxidation resistance under long-term high temperature environment).
3、 Manufacturing and process requirements
Processing technology
Spiral welding process: The weld seam needs to undergo radiographic or ultrasonic testing and complete a water pressure test without defects.
Heat treatment: Normalization+tempering treatment is required (to optimize grain structure and eliminate residual stress).
Testing standards
Execution standard: ASTM A335/A335M (Specification for High Temperature Ferritic Alloy Seamless Steel Pipe).
Supplementary experiment: ≥ The steel pipes of NPS8 need to undergo transverse tensile testing, and if they fail, they need to be reheated or rejected.
4、 Application scenarios
High temperature fluid transportation: Heating furnace pipelines and high-temperature steam systems in refining equipment.
Chemical equipment: high-temperature reactors, heat exchangers, and high-pressure pipelines.
Note: ASTM A333 standard is usually applicable to low-temperature steel pipes, while Grade 9 is more commonly used for high-temperature applications in ASTM A335 standard (such as A335P9).
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
Domestic phone number：0086-317-6689999
International call：0086-317-6165555
E-mail:9905791@qq.com
