Standard Steel Pipes & Tube

JIS G3445 Steel Pipe

JIS G3445 seamless steel tubes for machine structures and mechanical components. Specify the grade, dimensions, delivery condition and inspection requirements in your inquiry.

Custom grades & dimensionsFull quality traceabilityGlobal standards support

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Product details

Product Description

Technical Specifications & Standard Compliance

JIS G3445 establishes comprehensive requirements for cold-worked seamless carbon steel tubes used in mechanical structures. The standard covers multiple steel grades from STKM11 to STKM14, each designed to provide specific mechanical characteristics for different application needs. Our manufacturing expertise ensures full compliance with this respected Japanese standard while maintaining the high-quality benchmarks that define Tenjan’s production philosophy.

Material Excellence & Technical Advantages

Through advanced cold-drawing processes, Tenjan enhances the inherent properties of JIS G3445 tubes:

Precision Manufacturing Benefits

•Exceptional dimensional accuracy with tight diameter and wall thickness tolerances

•Superior surface finish both internally and externally, minimizing machining requirements

•Enhanced mechanical properties through controlled cold-working processes

•Consistent material structure and performance characteristics throughout production batches

Material Performance Characteristics

•Optimal balance of strength and ductility for structural applications

•Excellent machinability and cold-forming capabilities

•Reliable performance under static and dynamic loading conditions

•Superior surface quality for direct application or further processing

Quality Grades & Material Selection

JIS G3445 offers versatile material options to match specific application requirements:

STKM Series Applications

•STKM11/12: General mechanical structures requiring good formability

•STKM13/14: High-strength applications demanding enhanced mechanical properties

•Various heat treatment conditions (A/B/C) to achieve desired strength-ductility balance

Quality Assurance & Testing Protocols

Tenjan’s commitment to quality ensures every JIS G3445 tube meets the highest standards:

Comprehensive Testing Regime

•Full mechanical properties verification including tensile and yield strength

•Dimensional accuracy certification for all critical parameters

•Surface quality inspection and validation

•Additional testing including flattening, bending, or flaring as required

Certification & Documentation

•Complete material traceability and quality documentation

•Mill test certificates providing detailed test results

•ISO 9001 certified manufacturing processes

•Customized documentation supporting specific project requirements

Applications & Engineering Solutions

JIS G3445 seamless tubes from Tenjan deliver reliable performance across diverse industries:

Automotive Engineering

•Shock absorber components and suspension systems

•Steering mechanism parts and structural supports

•Engine and transmission system components

Precision Machinery

•Machine tool structural elements and guides

•Automation equipment frames and components

•Industrial robot arms and positioning systems

Hydraulic Applications

•Hydraulic cylinder barrels and piston components

•High-pressure fluid system components

•Pneumatic system structural elements

General Mechanical Structures

•Industrial equipment frames and supports

•Material handling system components

•Specialized machinery structural elements

International Standard Correlations

JIS G3445 maintains technical alignment with major international standards:

•Corresponds to DIN 2391 (German standard for precision seamless tubes)

•Aligns with GB/T 3639 (Chinese standard for cold-drawn precision seamless tubes)

•Compatible with similar mechanical tubing specifications globally

Tenjan Manufacturing Advantage

Our specialized expertise in cold-drawn seamless tubing delivers distinct benefits for mechanical applications:

Technical Excellence

•Advanced cold-drawing technology ensuring precision dimensions

•Comprehensive material selection guidance for optimal performance

•Engineering support for custom requirements and applications

•Technical consultation for structural optimization

Quality Commitment

•Stringent process controls throughout manufacturing

•Continuous quality monitoring and improvement initiatives

•Professional technical assistance for application engineering

•Reliable performance in demanding mechanical applications

Customer-Centric Approach

•Flexible manufacturing accommodating specific project needs

•Responsive service supporting tight project timelines

•Comprehensive technical documentation packages

•After-sales support ensuring application success

Through our dedicated manufacturing approach, Tenjan delivers JIS G3445 tubes that combine standard compliance with practical engineering excellence. Our expertise in cold-drawing processes ensures we can meet your specific mechanical structural requirements while maintaining the highest standards of quality and reliability for your most challenging applications.

Precision Seamless Carbon Tubes for Industrial Applications

Custom Sizes OD10-108mm – ASTM/EN/DIN/JIS/GOST Certified – Small-Batch Friendly

Technical data

Product Specifications

Parameter	Key Features
Outer Diameter	10-108mm (0.39″-4.25″) • Fully customizable
Wall Thickness	1-20mm (0.039″-0.79″) • ±0.1mm precision tolerance
Material	Carbon Steel • Alloy Steel • Special grades available
Process	Cold Drawn & Cold Rolled for superior finish

Available materials

Shaped Seamless Steel Tube&Pipe - Steel Grade Availability

Industry	Typical Grades We Supply
GB	DT4,Y15,10#,20#,20G,Q235,25Mn,35#,45#,55#
ASTM	1215,1008,1010,1020,A105,A106 Gr.B,A36,1026,1035,1045,1055,SA179,SA192
EN	DC01,11SMn30,P235TR1,P195GH,P265TR2,E235
DIN	DC01,11SMn30,CK10,C10,ST35.8,C20,CK20, ST45.8,St37,S235JR,C26D,CK35,CK45,CK55
JIS	SUM22,S10C,STKM11A,STPT370,STB35,S20C,STKM12, STKM13,STPT410,STB42,SS400,S35C,S45C,S55C
GOST	08КП,10,20,Ст3сп,25,35,45,55
Other Speical Grades can be customized

Applications

Industry-Specific Solutions

Standard	Key Applications Parts	Relevant Standards	Our Advantages
Automotive and Motorcycle Component	Shock Absorbers,Steering Systems,Thrust Rods	EN 10305-1,JIS G3445, DIN 2391,ASTM A519	High fatigue strength,High yield strength,lightweight,precision dimensions (±0.1mm)
Engineering and Mining Support	Anchor Bolts,Support Pipes,Hydraulic Props	ASTM A519,DIN 2391, JIS G3441,EN 10297-1, ISO 10799	High Strength &Yield Strength&High Elongation Customization Service – Special steel grades,dimensions and surface treatments available according to project requirements
Construction Machinery	Drive shaft sleeves ,Gearbox Guide Tubes,Crane Boom Guide Tubes,Excavator Arm Tubes,Loader Frame Tubes, Arctic Low-Temperature Tubes	ASTM A519,DIN 2391, JIS G3445,EN 10210-1, GOST 8733,ASTM A106, ISO 9329	ID/OD tolerances of ±0.05mm.Wall thickness uniformity straightness ≤0.5mm/m
Fluid Transport Systems	Oil/Gas pipelines,chemical systems,Power/Energy	ASTM A106 Gr.B, EN 10216-2,GOST 8734	Eddy Current + Ultrasonic Testing,Hydrostatic Testing
High-Pressure Boilers	Superheaters,Steam lines,Reheaters,Economizers)	ASTM A192,DIN 17175, EN 10216, JIS G3461/G3462	Enhanced material density through cold-drawing/rolling ensures long-term stability Full Compliance with Int’l Standards,Superior Creep & Fatigue Resistance
Geological Drilling	Drill Pipe,Tubing	ASTM A519,API 5DP, EN 10208-2	High Strength & Wear Resistance precision Dimensions Impact & Fatigue Resistance
Agricultural Machinery	Hydraulic cylinders,drive shafts,Lift arms, steering housings,Boom frames	ASTM A519,EN 10210-1, DIN 2391,GOST 8733, JIS G3445	Material Advantages:High Strength & Lightweight,Precision Cold-Drawing Technology,Dimensional accuracy ±0.05mm
Petroleum Cracking Units	Reformer Tubes,Heat Exchanger Tubes,Reactor Feed Pipes,Transfer Lines,Quench Oil Pipes	ASTM A335,ASTM A213, EN 10216-2	Optimized Material Purity,Precision Dimensional Control,Customized Solutions

Why choose us

Custom Advantages

Tailored Features · Designed Exclusively for Your Needs

Hollow Steel Tubes for Machined Components – Review the Material Allowance Component Selection Considerations:

When comparing soft iron carbon tubes and 1215 free-cutting steel tubes with solid bar stock, review the machining allowance and required inspection.

Key Benefits:

✔ Compare Total Processing Cost– Compare hollow tubes with solid bar stock

✔ Machining Planning – Review boring, cutting and assembly requirements

✔ Material Allowance – Compare tube dimensions with the finished-part drawing

Applications: Automotive, Hydraulics, Fasteners, and Machined Components.

Cold Drawing + Cold Rolling Dual-Process Technology – Affordable Small-Diameter Seamless Steel TubesInnovative Production for Precision Tubes:

Our self-developed piercing mill combines cold drawing & cold rolling, optimizing efficiency for small-diameter seamless steel tubes (OD<50mm).

Key Advantages:

✔ Cost Review – Compare material allowance and processing requirements

✔ Tolerance Review– Confirm dimensional and surface acceptance criteria

✔ Delivery Planning– Agree lead time for the specified profile and quantity

Applications: Automotive, Hydraulics, Oil & Gas/Petrochemical, High-Pressure Boilers and Fluid Transport Systems.

Carbon Steel Grade Selection for Machining and Structural Components Premium Steel Supply Chain:

Review material sourcing with Baosteel, Xingcheng and Shagang. Confirm availability for the listed 100+ carbon steel grades, and agree the grade, delivery condition and acceptance requirements for each order.

Customization Advantages:

✔ Chemical Composition– Adjust C, Mn, Si, etc. for specific applications

✔ Mechanical Properties– Yield/Tensile strength optimization

✔ Rigorous QC– Full inspection (UT, hardness testing, dimensional checks)

✔ Project-Specific Procurement Review– Consider order quantity and downstream processing costs

Key Industries Served: Machining, Automotive, Construction and Infrastructure, Oil & Gas, Heavy Equipment

Tube Straightening and Machining Preparation – Confirm the Required StraightnessStraightness and Machining Review:

Confirm the required carbon steel tube straightness, including the stated ≤0.5mm/m value, against the order specification before machining or assembly.

Key Advantages:

✔ Plan the Machining Allowance– Confirm straightness before lathe processing

✔ Cutting Tool Selection– Match tooling and cutting conditions to the supplied grade and hardness

✔ Production Planning– Review machining allowance, handling and scrap criteria

Production and Inspection Review:

In-House Developed Equipment– Customized for machining-grade precision

Production Experience Review– Confirm the relevant experience and production control plan

Automated Quality Control– Consistent straightness verification

Applications to Review: Hydraulic Cylinder Tubes, Automotive Shafts, Industrial Machinery, Oil & Gas Equipment

Ultrasonic + Eddy Current Dual-Testing – 0.20mm Flaw Detection for Critical Steel Tubes Inspection Method and Acceptance Criteria:

Our dual-technology inspection system delivers 0.20mm flaw detection accuracy; confirm the reference standard and acceptance criteria for the application.

Dual-Testing Advantages:

✔ Ultrasonic Testing (UT)– Detects 0.20mm micro-cracks & inclusions

✔ Eddy Current (ET)– Pinpoints surface/subsurface defects

✔ Multi-Probe Array– 360° coverage (ID/OD/wall thickness)

Two-Layer Quality Assurance

Flaw Detection: Cracks/pores/inclusions ≤0.20mm

Dimensional Control: ±0.05mm tolerance verification

Critical Applications: Automotive Airbag Tubes, Fluid Transport Systems, Petrochemical High-Pressure Piping