JIS G3461 Standard Boilers and Heat Exchangers

JIS G3461 Standard Boilers and Heat Exchangers

JIS G3461 carbon steel pipes are widely used in heat exchange systems, including water pipes, flue gas ducts, superheater tubes, and air preheater tubes. These pipes are commonly found in boiler systems, heat exchangers, and condensers. They are also suitable for applications in the chemical and petroleum industries, though they are not recommended for use under low-temperature conditions due to their limited toughness at such temperatures.

Chemical Composition:

Grade Manufacturing Process Chemical Composition (%)
C Si Mn P S Ni Cr Mo Others
STB35 S, E 0.18Max 0.35Max 0.30~0.60 0.035Max 0.035Max - - - -
STB42 S, E 0.32Max 0.35Max 0.30~0.60 0.035Max 0.035Max - - - -
STB52 S, E 0.25Max 0.35Max 1.00~1.50 0.035Max 0.035Max - - - -

Mechanical Properties:

Symbol of Class Tensile Strength
N/mm² {kgf/mm²}		 Yield Point or Proof Stress
N/mm² {kgf/mm²}		 Elongation %
Outside Diameter 20mm or Over Outside Diameter 10mm or Over to Excl. 10mm Outside Diameter Under 10mm
No. 11 Test Piece No. 12 Test Piece No. 11 Test Piece No. 11 Test Piece
STB340
STB410
STB510		 340{35} min.
410{42} min.
510{52} min.		 175{18} min.
255{26} min.
295{30} min.		 35 min.
25 min.
25 min.		 30 min.
20 min.
20 min.		 27 min.
17 min.
17 min.

Manufacturing Method:

Symbol of Class Heat Treatment
Hot Finished Seamless Steel Tube Cold Finished Seamless Steel Tube Electric Resistance Welded Steel Tube (Other than Hot or Cold Finished) Finished Electric Resistance Welded Steel Tube Fold Finished Electric Resistance Welded Steel Tube
STB 340 As manufactured, as required, low temperature annealing or normalizing may be performed. Low temperature annealing, normalizing or full annealing. Normalizing As manufactured. However, as required, low temperature annealing or normalizing may be performed. Normalizing
STB 410 As manufactured. However, as required, low temperature annealing or normalizing may be performed. Low temperature annealing, normalizing or full annealing. Normalizing Low temperature annealing
STB 510 Normalizing

These JIS G3461 steel pipes are known for their strength and durability, making them ideal for high-temperature environments commonly found in industrial boilers and heat exchangers. The specific grades—STB35, STB42, and STB52—are selected based on the required mechanical properties and application conditions. Proper heat treatment is essential to ensure the material meets the necessary performance standards. Whether used in power generation, chemical processing, or other demanding environments, these pipes offer reliable service when properly selected and maintained.

Screwdriver Series

Introduction to screwdriver tool set
The car repair screwdriver tool set is a precision tool set designed for vehicle maintenance, electronic equipment disassembly, interior adjustment, etc. It includes multiple types of blade heads, handle designs, and auxiliary accessories, suitable for screws of different specifications (such as cross, straight, hexagonal, star, etc.).
---------------------------------------------------------------------------------------------------------------------
Advantages of screwdriver tool set
Comprehensive compatibility: covering over 90% of screw types (interior, electronic, mechanical components) in automobiles.
Precise operation: The slender blade or extended rod can reach concealed positions (such as car lights, ECU modules).
Efficient and labor-saving: The ratchet design reduces wrist fatigue, and the magnetic blade head prevents it from falling off.
Strong durability: S2 alloy steel or chrome vanadium steel blade, wear-resistant and crack resistant.
Portable storage: Compact toolbox or elastic strap design, easy to carry with the car.
Anti static/Insulation: Some sets include insulated handles, suitable for in car circuit maintenance.

Screwdriver Set ,Flat Head Screwdriver,Driver Bit Set,Impact Screwdriver Set

Ningbo Anyun Tai Metal Products Co., Ltd. , https://www.eurokingtools.com