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The ASTM A358 TP304L (UNS S30403) supplied by Hebei K-Steel pipe Industry is an Electric Fusion Welded (EFW) austenitic stainless steel pipe designed for high-temperature and general corrosive service. The "L" grade indicates a low carbon content (≤0.03%), providing superior resistance to intergranular corrosion after welding without requiring post-weld heat treatment. This standard covers Class 1 through Class 5 pipe based on radiographic examination requirements, offering flexibility for various application criticality levels.

Key Features:

1) Excellent corrosion resistance in a variety of environments

2) Low carbon content reduces risk of intergranular corrosion after welding

3) Good weldability and formability

4) Large-diameter EFW format suitable for industrial piping projects

ASTM A554 Grade 304 Welded Stainless Steel Mechanical Square Tube supplied by Hebei K-Steel pipe industry is a cold-formed, high-frequency welded (HFW) austenitic stainless steel tube designed for mechanical, architectural, and decorative applications. As the most widely specified grade under the ASTM A554 standard, it offers an excellent combination of corrosion resistance, mechanical strength, formability, and surface finish — all at a cost-effective price point.

Key Features:

1) Excellent corrosion resistance in atmospheric and mild chemical environments

2) Available in mill finish, brushed (#4), mirror polish (#8), or satin finishes to meet decorative and architectural requirements

3) Good weldability and fabrication performance, can be easily cut, drilled, bent, welded, and punched without cracking for most standard wall thicknesses

4) Cost-effective solution for structural and ornamental applications, offers superior value compared to 316L grade, ideal for projects where extreme corrosion resistance is not required

ASTM A270 Grade TP316L stainless steel sanitary tubing from Hebei K-Steel Pipe Industry is specifically designed for high-purity and corrosive-resistant applications in the pharmaceutical, biotechnology, food and beverage, and cosmetic industries. Manufactured in accordance with ASTM A270 standards, this tubing offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, thanks to its low carbon content (0.03% max) and molybdenum addition.

Key Features:

1) Typically available in OD sizes from 1/2" to 6" or metric equivalents, with wall thickness schedules meeting sanitary requirements

2) Polished internal and external surfaces for hygienic applications

3) Excellent corrosion resistance in chloride-containing and sanitary environments

ASTM A213 TP316L supplied by Hebei K-Steel Pipe Industry is a seamless austenitic stainless steel tube specifically designed for high-temperature and high-pressure service in boilers, superheaters, and heat exchangers. The "L" grade indicates low carbon content (≤0.035%), which provides superior resistance to intergranular corrosion after welding. The addition of molybdenum (2.0-3.0%) enhances corrosion resistance, particularly against chlorides and other aggressive media.

Key Features:

1) The molybdenum content provides excellent resistance to chlorides, acids, and marine environments, outperforming TP304L in aggressive conditions

2) Suitable for high-temperature and chemical processing applications

3) Low carbon content reduces risk of intergranular corrosion

ASTM A790 Grade UNS S32760 duplex stainless steel pipe is a high-performance super duplex stainless steel pipe designed for extreme corrosion and high-strength applications. This grade features a balanced ferritic-austenitic microstructure (approximately 40–50% ferrite / 50–60% austenite) with added tungsten and copper, which further enhance its resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in aggressive environments. UNS S32760 is available in seamless and welded constructions, offering superior performance compared to standard duplex grades like S31803 and S32205.

Key Features:

1) Superior corrosion resistance, PREN (Pitting Resistance Equivalent Number) typically ≥ 40, significantly higher than standard duplex grades

2) Minimum yield strength ≥ 550 MPa (80 ksi) – approximately 2.5 times that of 316L

3) Outstanding resistance to stress corrosion cracking (SCC)

ASTM B444 UNS N06625 tube (commonly known as Alloy 625)supplied by Hebei K-Steel Pipe Industry is a high-performance nickel-chromium-molybdenum alloy tube designed for extreme corrosion and high-temperature environments. It offers outstanding strength, oxidation resistance, and corrosion resistance, making it suitable for the most demanding industrial applications.

UNS N06625 is strengthened by niobium (Nb) and molybdenum, providing excellent mechanical properties without the need for heat treatment. Its superior resistance to pitting, crevice corrosion, and stress corrosion cracking makes it a preferred material in aggressive chemical and marine environments.

Key Features:

1) Exceptional corrosion resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride and seawater environments

2) The addition of niobium stabilizes the alloy against sensitization and provides high yield and tensile strength without requiring heat treatment

3) Good weldability without post-weld heat treatment

The ASTM A335 Gr. P9 seamless tube supplied by Hebei k-steel pipe industry is a chromium-molybdenum (Cr-Mo) alloy steel pipe primarily used for high-temperature service. With a nominal composition of 9% chromium and 1% molybdenum, Grade P9 offers excellent oxidation resistance and high-temperature strength, making it ideal for demanding applications in power generation, petrochemical, and refining industries.

Key Features:

1) Superior resistance to high-temperature oxidation and scaling

2) Enhanced creep strength and fatigue resistance

3) Good thermal conductivity and low thermal expansion

ASTM A213 Grade T22 alloy steel tube is a high-performance chromium-molybdenum (2.25Cr–1Mo) steel tube designed for high-temperature and high-pressure service. It is widely used in power generation, petrochemical, and industrial boilers, where durability, creep resistance, and oxidation resistance are critical.

T22 offers a perfect balance of strength, thermal stability, and long-term service performance, making it suitable for superheaters, heat exchangers, and high-temperature piping systems. The Hebei K-Steel Pipe Industry seamless manufacturing process ensures a uniform microstructure, high integrity, and reliable mechanical properties.

Key Features:

1) Excellent high-temperature strength and creep resistance

2) Good resistance to high-temperature oxidation and hydrogen attack

3) Reliable performance under cyclic thermal loading

ASTM A213-T91 is a high-strength alloy steel tube used primarily for high-temperature service in power generation and petrochemical industries. Hebei K-Steel Pipe Industry is in the supplier list of PETROCHINA It is a chromium-molybdenum (Cr-Mo) ferritic steel, known for excellent creep strength, oxidation resistance, and thermal stability.

Element

Content (%)

Carbon (C) 0.08–0.12

Manganese (Mn) 0.30–0.60

Phosphorus (P) ≤0.020

Sulfur (S) ≤0.010

Silicon (Si) 0.20–0.50

Chromium (Cr) 8.00–9.50

Molybdenum (Mo) 0.85–1.05

Nickel (Ni) 0.40 max

Vanadium (V) 0.18–0.25

Nitrogen (N) 0.06–0.12

Property

Typical Value

Tensile Strength 585–690 MPa

Yield Strength 415–450 MPa

Elongation ≥20%

Hardness (HRB) 197–217

Applications

Boiler tubes in power plants

Superheater and reheater tubes

High-temperature piping in refineries and chemical plants

Heat exchangers subjected to creep and oxidation

Key Features

High resistance to creep deformation at elevated temperatures (up to ~600 °C).

Good oxidation and corrosion resistance in high-temperature steam environments.

Excellent weldability when proper procedures are followed.

Overview of S275JR Steel of Hebei K-steel Pipe Industry

EN 10025-2 defines S275JR as a non-alloy steel grade widely used for general engineering and construction purposes.

“S” = Structural steel

“275” = Minimum yield strength of 275 MPa

“JR” = Impact test at +20°C (27J minimum)

2. Applicable Standards for Steel Pipes

S275JR material is typically used in pipes manufactured under:

2.1 Structural Steel Pipe Standards

EN 10219

EN 10210

Applications:

Structural tubing

Mechanical and construction pipes

2.2 Alternative Equivalent Standards

S275JR is often compared with:

ASTM A36 (USA equivalent)

Q275

3. Chemical Composition (Typical, %)

Element Content (%)

C (Carbon)≤ 0.21

Mn (Manganese)≤ 1.50

P (Phosphorus)≤ 0.035

S (Sulfur)≤ 0.035

N (Nitrogen)≤ 0.012

Low carbon content → good weldability and formability

4. Mechanical Properties

Property Value

Yield Strength≥ 275 MPa

Tensile Strength410 – 560 MPa

Elongation≥ 23%

Impact Test 27J @ +20°C

5. Manufacturing Process of S275JR Pipes

5.1 Common Production Methods

ERW (Electric Resistance Welded)

LSAW (Longitudinal Submerged Arc Welded)

Seamless (less common for this grade)

5.2 Delivery Conditions

As-rolled Normalized (optional for better properties)

6. Applications of S275JR Steel Pipes

Widely used in:

Structural construction (buildings, bridges)

Mechanical engineering

Steel frameworks

Low-pressure fluid transportation (water, air)

General fabrication

Not recommended for:

High-pressure pipelines

High-temperature or corrosive environments

7. Key Advantages

Good weldability

Moderate strength with good ductility

Cost-effective compared to alloy steels

Widely available in global markets

8. Limitations

Lower strength compared to high-grade steels (e.g., S355)

Limited corrosion resistance

Not suitable for oil & gas high-pressure service

9. Summary

S275JR steel pipe is a standard structural-grade carbon steel pipe under EN 10025-2, offering:

Reliable mechanical performance

Excellent fabrication properties

Broad application in construction and general engineering

ASTM A179/A179M, from Hebei K-Steel Pipe Industry is a standard specification for seamless cold-drawn low-carbon steel tubes primarily used in tubular heat exchangers, condensers, and similar heat transfer equipment. It is widely valued for its high dimensional accuracy, smooth surface finish, and excellent thermal conductivity

Key Specifications and Grades

The standard covers tubes with an outside diameter (OD) ranging from 1/8 inch to 3 inches (3.2 mm to 76.2 mm). It typically includes two primary grades

Grade A: A standard grade with a minimum yield strength of 35 ksi (240 MPa), ideal for general industrial applications.

Grade C: A higher-strength version with a minimum yield strength of 47 ksi (325 MPa), suitable for more demanding high-pressure environments.Chemical and Mechanical PropertiesProperty                             RequirementCarbon Content              0.06% – 0.18% (ensures ductility and weldability)Manganese                      0.27% – 0.63%Tensile Strength              Min. 47 ksi (325 MPa)Hardness                          Max. 72 HRB (Rockwell Hardness, B scale)Thermal Treatment          Must be heat treated (annealed) at 1200°F (650°C) or higher after final cold drawingManufacturing and TestingAs specified by ASTM International, these tubes must be manufactured using the seamless process and finished through cold drawing. To ensure safety under high pressure, each tube must undergo rigorous quality checks:

Flattening and Flaring Tests: To verify the material's ductility and ability to withstand mechanical deformation.

Hydrostatic or NDT Test: Every tube is subjected to a water pressure test or a non-destructive electric test to ensure it is leak-free.

Dimensional Checks: Precise wall thickness and outer diameter tolerances are strictly maintained.Due to their reliability in varying temperatures and pressures, ASTM A179 tubes are essential in several sectors: Power Plants: In condensers and boiler feed-water heaters.

Petrochemical Industry: For refining and cooling processes in heat exchangers.

Marine Systems: Used in seawater cooling equipment due to its adaptability.

Product Description

Galvanized hollow section (GHS) is a high-strength, steel tubular product featuring a zinc-coated surface that protects against corrosion. It is widely used in construction and industrial applications where durability, structural integrity, and resistance to environmental damage are required.Galvanized hollow section is high selling product for Hebei K-Steel Pipe Industry

Key Characteristics & Benefits

Corrosion Resistance: The zinc coating (via hot-dip or pre-galvanization) acts as a sacrificial barrier against rust and moisture, offering a long service life, often up to 30–50 years.

High Strength-to-Weight Ratio: The hollow design provides excellent load-bearing capacity while being lighter than solid steel profiles.

Versatility & Aesthetics: Available in various shapes and sizes with a smooth, clean aesthetic suitable for visible architectural applications.

Easy Fabrication: They can be cut, welded, and bolted to create complex frameworks.

Types of Galvanized Hollow Sections

SHS (Square Hollow Section): Used for columns, frames, and fencing.

RHS (Rectangular Hollow Section): Preferred for beams, heavy frames, and structural supports.

CHS (Circular Hollow Section): Often used for railing and piping.

Hot-Dip Galvanized: Immersed in molten zinc after forming, creating a thick, highly durable coating suitable for harsh environments.

Pre-Galvanized: Formed from pre-coated steel strips, providing a uniform, smooth surface ideal for indoor/light-duty applications.

Galvanized hollow sections are used extensively across several sectors:

Structural & Construction: Building frames, roof supports, purlins, and truss systems.

• Infrastructure: Guardrails, signboards, and bridge supports.

• Industrial & Agricultural: Conveyor supports, greenhouse frames, and farm fencing.

Product Description

EN 10210-1 S235JRH welded pipe is made from non-alloy quality steel, widely used in construction and civil engineering.Hebei K-Steel Pipe Industry supplied them to the north of Africa S: Indicates it is a structural steel. 235: Denotes a minimum yield strength of 235 MPa (for thicknesses 16 mm). JRH: Signifies specified impact properties of at least 27 Joules at 20°C, ensuring toughness for lightweight structural uses. EN 10210-1: The standard covering technical delivery conditions for hot-finished hollow sections.

Manufacturing Process for Welded Pipes and inspection in the metal test lab.

While EN 10210-1 covers hot-finished products, welded pipes are typically produced through methods like Electric Resistance Welding (ERW), High-Frequency Induction (HFI), or Submerged Arc Welding (SAW).

Property                                               Value for Thickness 16 mm

Tensile Strength                               360 – 510 MPa

Minimum Yield Strength                  235 MPa

Minimum Elongation                       24 – 26%                        

Carbon (C) Content                         less than 0.17%

Manganese (Mn)                              less than 1.40%

Common Applications

Infrastructure: Transmission towers, bridge girders, and highway sign gantries.

Construction: Frameworks for commercial buildings, warehouses, and agricultural sheds.

Mechanical: Frames for light machinery, automobile sectors, and decorative architectural structures.

St37 seamless pipe from Hebei K-steel Pipe Industry Co.,Ltd. is a widely utilized, low-carbon structural steel, often conforming to German standards (DIN 17100, DIN 1629, or DIN 2391). The number "37" indicates a minimum tensile strength of 370 N/mm² (or roughly 360-460 MPa). As a seamless pipe, it is manufactured from solid round steel billets that are heated and formed without any weld joints, ensuring high pressure resistance, excellent structural integrity, and uniform wall thickness.

Key Properties

Composition: Low carbon steel, typically featuring less than 0.17% carbon, along with silicon and manganese, making it highly weldable and ductile.

Strength & Durability: Offers a minimum yield strength of approximately 235 MPa, providing strong, reliable performance for structural and load-bearing applications.

Fabrication: Excellent cold bending, workability, and machining properties due to the lower carbon content.

Finish: Commonly supplied in hot-rolled or cold-drawn finishes, including black or galvanized coatings to improve corrosion resistance.

Common Standards: Often found under DIN 1629 (for seamless tubes of non-alloy steels) and DIN 2391 (for seamless precision steel tubes.Common Applications

General Engineering: Used in machinery components, structural frameworks, bridges, and construction projects.

Fluid Transmission: Suitable for transporting liquids and gases like oil, gas, and water at lower to medium pressure.

ASTM A500 Grade C welded square steel tube is a high-strength structural tubing solution engineered for demanding load-bearing applications of Hebei K-Steel Pipe Industry. Cold-formed from carbon steel and electric resistance welded (ERW), this ASTM A500 Grade C tubing delivers superior mechanical properties over Grades A and B, providing an excellent combination of strength, weldability, and dimensional precision for construction and industrial projects.

Key Features:

1) High yield strength for structural applications

2) Cost-effective solution for large-scale projects

3) Excellent weldability and formability

ASTM A500 Grade C welded round steel tube is a high-strength carbon steel tube widely used in construction, infrastructure, and mechanical applications. Hebei K-Steel Pipe Industry offers excellent strength, durability, and weldability, making it ideal for load-bearing structures and engineering projects

Manufactured in accordance with ASTM A500, Grade C provides higher strength compared to Grade A and Grade B, ensuring reliable performance in demanding structural environments.

Key Features:

1) High yield strength for structural applications

2) Cost-effective solution for large-scale projects

3) Excellent weldability and formability

ASTM A333 Grade 6 from Hebei K-Steel Pipe Industry is the most widely specified carbon steel pipe material for low-temperature service applications. Manufactured in accordance with ASTM A333/A333M, this specification covers seamless and welded carbon and alloy steel pipe intended for use at low temperatures and other applications requiring notch toughness.

Key Features:

1) Both seamless and welded options in a wide range of sizes

2) Mandatory impact testing ensures reliability at -45°C proven low-temperature performance

3) Excellent weldability, pre-heat typically not required