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Introduction
JIS G 3441 is a Japanese
Industrial Standard covering alloy steel tubes used in machinery, automobiles
and other machine parts. These tubes are manufactured from alloy steels
containing elements such as chromium and molybdenum to provide suitable
strength, hardenability, toughness and wear resistance.
JIS G 3441 alloy steel tubes
are used in mechanical components that require dependable performance,
dimensional accuracy and the ability to withstand demanding operating
conditions.
Applicable Standard
JIS G 3441:2025 – Alloy Steel
Tubes for Machine Purposes.
The 2025 edition was
published on 21 April 2025 and supersedes JIS G 3441:2021.
Material Type
Alloy Steel (AS)
JIS G 3441 covers alloy steel
tubes, including chromium steel and chromium-molybdenum steel grades. These
materials are distinct from stainless steel and conventional carbon steel.
Scope
The standard specifies
requirements for alloy steel tubes used in:
·
Machinery
and mechanical equipment
·
Automobile
components
·
Machine
parts and assemblies
·
Engineering
components requiring strength and hardenability
·
Applications
involving mechanical loading and wear
Available Grades
Commonly referenced JIS G
3441 grade designations include:
·
SCr
420 TK
·
SCM
415 TK
·
SCM
418 TK
·
SCM
420 TK
·
SCM
430 TK
·
SCM
435 TK
·
SCM
440 TK
SCr grades are chromium alloy
steels, while SCM grades are chromium-molybdenum alloy steels. Grade
availability and the applicable designation list should be checked against the
current JIS G 3441:2025 edition before ordering.
Chemical Composition
The chemical composition
varies according to the selected grade. The following table provides reference
composition values for commonly listed grades. These values are drawn from
published JIS G 3441 grade data and should be verified against the current
edition and the material test certificate.
|
Grade |
C (%) |
Si (%) |
Mn (%) |
P (max.) |
S (max.) |
Cr (%) |
Mo (%) |
|
SCr 420 TK |
0.18–0.23 |
0.15–0.35 |
0.60–0.85 |
0.030 |
0.030 |
0.90–1.20 |
— |
|
SCM 415 TK |
0.13–0.18 |
0.15–0.35 |
0.60–0.85 |
0.030 |
0.030 |
0.90–1.20 |
0.15–0.30 |
|
SCM 418 TK |
0.16–0.21 |
0.15–0.35 |
0.60–0.85 |
0.030 |
0.030 |
0.90–1.20 |
0.15–0.30 |
|
SCM 420 TK |
0.18–0.23 |
0.15–0.35 |
0.60–0.85 |
0.030 |
0.030 |
0.90–1.20 |
0.15–0.30 |
|
SCM 430 TK |
0.28–0.33 |
0.15–0.35 |
0.60–0.85 |
0.030 |
0.030 |
0.90–1.20 |
0.15–0.30 |
|
SCM 435 TK |
0.33–0.38 |
0.15–0.35 |
0.60–0.85 |
0.030 |
0.030 |
0.90–1.20 |
0.15–0.30 |
|
SCM 440 TK |
0.38–0.43 |
0.15–0.35 |
0.60–0.85 |
0.030 |
0.030 |
0.90–1.20 |
0.15–0.30 |
Mechanical Properties
The mechanical properties of
JIS G 3441 alloy steel tubes depend on the grade, tube dimensions,
manufacturing process and heat-treatment condition.
The principal mechanical
characteristics include:
·
Tensile
strength
·
Yield
strength or proof stress, where specified
·
Elongation
·
Hardness
·
Hardenability
and heat-treatment response
Mechanical testing
requirements and acceptance values must be confirmed against the selected grade
and applicable delivery condition. Where additional tensile, impact or hardness
testing is required, the relevant requirements should be agreed upon at the
time of ordering.
Manufacturing Process
JIS G 3441 alloy steel tubes
are produced through suitable tube-manufacturing processes, which may include:
·
Alloy
steel melting and refining
·
Billet
preparation
·
Tube
piercing and rolling
·
Hot
finishing or cold finishing, where applicable
·
Sizing
and straightening
·
Heat
treatment according to the specified requirements
·
Dimensional
inspection and testing
The manufacturing route
depends on the grade, dimensions and required properties.
Heat Treatment
Heat treatment is used to
obtain the required mechanical properties and performance characteristics.
Depending on the grade and application, treatments may include annealing,
normalizing, quenching and tempering.
The specified heat-treatment
condition should be confirmed with the material grade and purchase
requirements.
Dimensions and Tolerances
JIS G 3441 alloy steel tubes
are supplied in specified outside diameters, wall thicknesses and lengths.
Dimensional tolerances are governed by the applicable standard requirements and
ordered specifications.
Key dimensional parameters
include:
·
Outside
diameter
·
Wall
thickness
·
Length
·
Straightness
·
Dimensional
tolerances
Custom dimensions may be
considered subject to manufacturing capability and order requirements.
Product Characteristics
·
Alloy
steel composition for mechanical applications
·
Suitable
hardenability and heat-treatment response
·
Good
strength and toughness when properly specified
·
Chromium
and molybdenum alloying for improved hardening characteristics
·
Suitable
for demanding machinery and automotive components
·
Available
in different grades for varied engineering requirements
Forms of Supply
JIS G 3441 alloy steel tubes
can be supplied in specified tube dimensions, lengths and agreed delivery
conditions according to customer requirements. Supply details should be
confirmed based on grade, manufacturing route, heat treatment and order
specifications.
Applications
JIS G 3441 alloy steel tubes
are used in:
·
Automotive
components
·
Mechanical
shafts and machine parts
·
Transmission
and drivetrain components
·
Industrial
machinery
·
Engineering
equipment
·
Mechanical
assemblies
·
Components
requiring heat-treated alloy steel
Availability
JIS G 3441 alloy steel tubes
are available on an order basis, subject to grade, dimensions, mill sourcing
and stock availability. Ladhani Metal Corporation supports enquiries for
material requirements according to customer specifications.
Conclusion
JIS G 3441 alloy steel tubes
are suitable for machinery, automotive and engineering applications that
require reliable mechanical properties and heat-treatment capability. Ladhani
Metal Corporation supports the supply of alloy steel tubes according to
specified grades, dimensions and project requirements.
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