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Water, Natural Gas and Steam Transportation Steel Pipe

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Description
Characteristics
Machining Data

Steel Grades

Standard OrganizationSteel Grades for PipesTypical Applications
ASTM (American Society for Testing and Materials)A53, A106, A333, A335, API 5L Grades B, X42, X52, X65Water, Natural Gas, Steam, High-Temperature Services
AISI (American Iron and Steel Institute)- (AISI does not typically specify pipe grades)-
GB (Chinese National Standard)Q235, Q345, L245, L290, L360, L450Water, Natural Gas, Steam
JIS (Japanese Industrial Standards)STPG 370, STPG 410Water, Natural Gas
DIN (German Institute for Standardization)St37, St35.8, St45.8Water, Steam
EN (European Standard)P235GH, P265GH, S355J2H, L235, L275Water, Natural Gas, Steam

This table represents a small selection of the available grades for each standard. The standards bodies mentioned have many more grades to address various service conditions and requirements. Always consult the latest version of the standard for the most accurate and detailed information.


Advantages as a Steel Supplier

Wide Product Range:Offering a comprehensive range of steel products, from structural steels, tool steels, stainless steels, to specialty grades, ensuring customers find what they need.

Quality Assurance:Implementing rigorous quality control processes and adhering to international standards to ensure the steel supplied is of the highest quality.

Competitive Pricing:Leveraging economies of scale, efficient processes, and strategic partnerships to provide competitive pricing to customers.

Experienced Staff:Possessing a knowledgeable and experienced team capable of providing expert advice, technical support, and solutions tailored to the client's requirements.

Fast Delivery: Having a well-stocked inventory and efficient logistics capabilities to ensure timely delivery, even for bulk or urgent orders.

Customization Capabilities:Offering services like cutting, bending, welding, or other fabrication processes tailored to customers' specific needs.

Sustainability:Adopting eco-friendly practices and ensuring that steel production and supply align with sustainability goals, reducing environmental impact.

Strong Supplier Relationships:Maintaining robust relationships with leading steel mills and manufacturers, ensuring consistent supply and access to the latest innovations in steel.

Technology Integration:Utilizing modern technology for inventory management, order processing, and customer communication to streamline operations and enhance the customer experience.

Global Reach: Having the infrastructure and network to supply steel products to customers across different regions or even internationally.

After-sales Support:Providing excellent after-sales service, addressing any concerns, and ensuring customer satisfaction long after the initial purchase.

Research & Development: Continually investing in R&D to understand market trends, new steel applications, and emerging technologies in the steel industry.

Training & Development:Regularly training staff to stay updated with the latest industry standards, technologies, and best practices.

Transparency: Keeping customers informed about pricing, product availability, delivery times, and any other factors that might affect their purchase decisions.

Safety Focus: Ensuring all operations prioritize safety, reducing risks for both employees and customers.




Application Areas

Water Transportation: Steel pipes for water are often coated or galvanized to protect against corrosion. They can serve in municipal, industrial, and residential applications.

Natural Gas Transportation: These pipes must meet safety and regulatory standards for pressure and are often coated to protect against corrosion caused by soil and moisture.

Steam Transportation: Pipes for steam must withstand high temperatures and pressures, often requiring alloy steel with higher creep resistance.


Common Dimensions

The dimensions for steel pipes used in the transportation of water, natural gas, and steam can vary depending on the system requirements, pressure ratings, and applicable material standards. Commonly, pipes are specified by Nominal Pipe Size (NPS), which is a nominal number and not the actual dimensions, and by schedule, which refers to the wall thickness.

Here is a more specific table with dimensions based on NPS and Schedule for such pipes:

NPS (inch)Outer Diameter (OD) (inch)Schedule 40 Wall Thickness (inch)Schedule 80 Wall Thickness (inch)
1/20.840.1090.147
3/41.050.1130.154
11.3150.1330.179
22.3750.1540.218
33.50.2160.300
44.50.2370.337
66.6250.2800.432
88.6250.3220.500
1010.750.3650.593
1212.750.3750.688

Notes:

The outer diameter stays the same for each NPS, but the inner diameter decreases as the schedule number (wall thickness) increases.

The schedule number corresponds to the approximate value of the formula: 1000 x P/S1000 x P/S, where P is the internal service pressure and S is the allowable stress in psi.

For steam transportation which often involves high pressure and temperature, schedules 80, 160, or even XXS (double extra strong) may be required depending on the specific service conditions.

For exact requirements, one should consult the standards like the American Society for Testing and Materials (ASTM), American Petroleum Institute (API), and the American Water Works Association (AWWA) for water pipes, as well as other relevant standards for natural gas and steam pipes. These standards will dictate the precise steel grades, dimensions, and tolerances allowed.


Processing Technology

Seamless: Pipes made without a seam or weld-joint, typically used for high-pressure situations.

Welded: Pipes are welded using various technologies:

ERW (Electric Resistance Welded): Welding along the seam of the pipe by electric resistance.

LSAW (Longitudinal Submerged Arc Welding): Welding is done longitudinally in a single seam using submerged arc welding technology.

SSAW (Spiral Submerged Arc Welding): Pipes are welded with a helical seam using submerged arc welding.


Physical Properties

Steel Pipe GradeApplicationYield Strength (min)Tensile Strength (min)Elongation (min)Toughness (Impact Value)Hardness (max)
A53 Grade BGeneral, Water240 MPa415 MPa30%Not SpecifiedNot Specified
A106 Grade BHigh Temp, Steam240 MPa415 MPa30%Not SpecifiedNot Specified
API 5L X52Oil, Gas359 MPa455 MPa22%As per API 5LNot Specified
API 5L X65Oil, Gas450 MPa535 MPa18%As per API 5LNot Specified
P235GH (EN 10216-2)Water, Steam, Gas235 MPa360-500 MPa25%As per EN 10216Not Specified
S355J2H (EN 10210)Structural, Water355 MPa510-680 MPa20%As per EN 10210Not Specified
STPG 370 (JIS G3454)Water, Gas216 MPa370 MPaNot SpecifiedNot SpecifiedNot Specified
Q345B (GB/T 8162)General, Water, Gas345 MPa470-630 MPa20%As per GB/T 8162Not Specified

Please note that:

  • The yield strength is the stress at which a material begins to deform plastically.

  • The tensile strength is the maximum stress that a material can withstand while being stretched or pulled before necking.

  • Elongation is a measure of how much a material can stretch before breaking.

  • Toughness and hardness are material properties that are not always specified for pipe grades, as they can be highly dependent on the specific use case and required standards.

This table is for illustrative purposes and the exact values can differ based on manufacturing processes, heat treatment, and specific requirements of each standard. Always refer to the latest specifications from the relevant standards or certification bodies.


Chemical Composition

Steel Pipe GradeStandardCarbon (C)Manganese (Mn)Phosphorus (P)Sulfur (S)Silicon (Si)Other Elements
A53 Grade BASTM≤ 0.30%1.20% max≤ 0.05%≤ 0.045%--
A106 Grade BASTM≤ 0.30%0.29 - 1.06%≤ 0.035%≤ 0.035%≤ 0.10%-
API 5L X52API≤ 0.28%1.40% max≤ 0.030%≤ 0.030%-V, Nb, Ti
API 5L X65API≤ 0.16%≤ 1.65%≤ 0.02%≤ 0.01%-V, Nb, Ti
P235GHEN≤ 0.16%0.60 - 1.20%≤ 0.025%≤ 0.020%≤ 0.35%Cr, Ni, Mo, Cu
S355J2HEN≤ 0.22%≤ 1.60%≤ 0.030%≤ 0.030%≤ 0.55%-
STPG 370JIS≤ 0.25%0.30 - 0.90%≤ 0.040%≤ 0.040%--
Q345BGB≤ 0.20%1.00 - 1.60%≤ 0.045%≤ 0.045%≤ 0.55%Cr, Ni, Cu

Please note:

The chemical compositions listed are general ranges or maximums, and actual values may vary depending on the manufacturer and specific material batch.

The "Other Elements" column lists elements that may not be present in all specifications of a given grade but can be added for specific properties or to meet certain aspects of the standard. Not all possible elements are listed, as steel can contain numerous trace elements in small quantities.

It is essential to check the specific standard or manufacturer's certificate for the exact chemical composition of the steel pipe you are using, as the values can have significant implications for the pipe's performance in service.