JIS G3461 STB340 Carbon Steel Tube for Boiler and Heat Exchanger

• Customization: Available
• After-sales Service: Supplied
• Warranty: 30 Years
• Model NO.: Seamless
• Type: Seamless
• Technique: Cold Drawn
• Material: Carbon Steel
• Surface Treatment: Varnishing
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Material Composition: C≤0.18, Si≤0.35, Mn 0.30-0.60, P≤0.035
• Tensile Strength: ≥340 MPa
• Yield Strength: ≥205 MPa
• Delivery Condition: Hot-Rolled/Cold-Drawn, Annealed, Normalized
• Outer Diameter: 10.5–114.3 mm (Seamless)
• Wall Thickness: 1.0–12.0 mm
• Length: 5.8–12 M (Customizable)
• Surface: Sandblasted, Pickling, Oiled Anti-Rust
• Operating Temperature: -10°c to 450°c
• Equivalent Standards: ASTM A179, GB 3087, En 10216-2 P195gh
• Manufacturing Process: Seamless (Cold-Drawn/Hot-Rolled), Welded (ERW + No
• Testing Methods: Eddy Current Testing, Hydrostatic Test, Ultrasonic
• Packaging: Bundled with Wooden Pallets, Plastic End Caps
• Price Terms: Fob, CIF, EXW
• Lead Time: 30-60 Days
• Transport Package: Plywood Case, Bundled with Plastic Bags
• Specification: OD 17.2-168.3mm
• Trademark: EZS
• Origin: China
• HS Code: 73043190
• Production Capacity: 200000 Tons/Year

Product Description

 

Product Description

 

1. Product Overview

JIS G3461 STB340E is a low-carbon steel tube specifically designed for boilers and heat exchangers under high-temperature and high-pressure conditions. Manufactured via seamless cold-drawn or hot-rolled processes, it ensures superior thermal efficiency and durability in industrial applications

2. Compliance & Standards

• JIS G3461-1988: Strict adherence to Japanese Industrial Standards for chemical composition, mechanical properties, and testing protocols
• Global Equivalents: Direct replacement for ASTM A179 (USA), GB 3087 (China), and EN 10216-2 P195GH (Europe), facilitating cross-border procurement

3. Material Analysis

• Chemical Composition:
  • Carbon (C): ≤0.18% ensures excellent weldability and low-temperature toughness.
  • Manganese (Mn): 0.30-0.60% enhances strength and creep resistance.
• Impurity Control: Low phosphorus (P) and sulfur (S) content minimizes brittleness and corrosion risks.

Category	Parameter	Requirement	Remarks
Chemical Composition	Carbon (C)	≤0.18%	Ensures weldability and low-temperature toughness.
	Silicon (Si)	≤0.35%	Improves deoxidation and strength.
	Manganese (Mn)	0.30-0.60%	Enhances tensile strength and creep resistance.
	Phosphorus (P)	≤0.035%	Minimizes brittleness and thermal cracking.
	Sulfur (S)	≤0.035%	Reduces hot-shortness and corrosion risks.
Mechanical Properties	Tensile Strength (Rm)	≥340 MPa	Guarantees structural integrity under high-pressure conditions.
	Yield Strength (Rp0.2)	≥205 MPa	Critical for load-bearing applications (e.g., boilers).
	Elongation (Amm)	≥30%	Indicates ductility for bending and forming operations.
	Hardness (Annealed State)	≤72 HRB	Ensures machinability and compatibility with welding processes.

4. Production Process

• Seamless Tubes:
  • Hot-Rolled: Perforated billets are rolled at high temperatures, followed by normalization for uniform microstructure.
  • Cold-Drawn: Precision cold drawing improves dimensional accuracy and surface finish, with low-temperature annealing to relieve stress.
• Welded Tubes: High-frequency electric resistance welding (ERW) with post-weld normalization ensures structural integrity.

5. Technical Performance

• Mechanical Properties:
  • Tensile Strength: ≥340 MPa (guarantees pressure resistance).
  • Elongation: ≥30% (ensures ductility under thermal stress).
• Thermal Stability: Maintains structural integrity at temperatures up to 450°C.

Property	STB340 (JIS G3461)	A179 (ASME)
C Content	≤0.18%	≤0.06-0.18%
Tensile Strength	≥340 MPa	≥325 MPa
Application Focus	Boilers, heat exchangers	Condensers, heat exchangers

6. Applications

• Power Plants: Used in boiler water walls, superheaters, and economizers.
• Petrochemical: Ideal for heat exchangers, condensers, and evaporators in refineries.
• HVAC Systems: Efficient heat transfer in industrial heating/cooling systems.

7. Quality Assurance

• Inspection Protocols:
  • Eddy Current Testing: Detects surface defects.
  • Hydrostatic Test: Validates pressure resistance (tested at 1.5× working pressure).
• Certifications: JIS mark and third-party reports (e.g., SGS) ensure global compliance.

8. Competitive Advantages

• Cost-Effective: Lower lifecycle costs due to high durability and minimal maintenance.
• Customization: Supports non-standard dimensions and specialized heat treatments (e.g., spheroidize annealing).

9. Packaging & Logistics

• Rust Prevention: Internal oil coating and external PE film protect against moisture during shipment.
• Safe Handling: Nylon slings prevent surface scratches during loading/unloading.