JIS G3445 steel tubes for machine structural purposes

JIS G3445 is Japanese Industrial Standard specifies the carbon steel tubes, hereinafter referred to as the "tubes", used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.

JIS G3445 STKM11A

Standards: JIS G3445

Size (mm):

Application: Tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.

The main products of steel / steel grade:

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers' requirements .

Painting: as requested.

JIS G3445 STKM11A
Chemical Compositions(%):
Grade C Si Mn P S
STKM11A ≤0.12 ≤0.35 ≤0.60 ≤0.040 ≤0.040
STKM12A ≤0.20 ≤0.35 ≤0.60 ≤0.040 ≤0.040
STKM12B ≤0.20 ≤0.35 ≤0.60 ≤0.040 ≤0.040
STKM12C ≤0.20 ≤0.35 ≤0.60 ≤0.040 ≤0.040
STKM13A ≤0.25 ≤0.35 0.30-0.90 ≤0.040 ≤0.040
STKM13B ≤0.25 ≤0.35 0.30-0.90 ≤0.040 ≤0.040
STKM13C ≤0.25 ≤0.35 0.30-0.90 ≤0.040 ≤0.040
STKM14A ≤0.30 ≤0.35 0.30-1.00 ≤0.040 ≤0.040
STKM14B ≤0.30 ≤0.35 0.30-1.00 ≤0.040 ≤0.040
STKM14C ≤0.30 ≤0.35 0.30-1.00 ≤0.040 ≤0.040

Appearance

 
Mechanical Properties:
Grade Yield Strength (Mpa) Tensile Strength (Mpa) Elongation (%)
STKM11A \ ≥290 ≥35
STKM12A ≥175 ≥340 ≥35
STKM12B ≥275 ≥390 ≥25
STKM12C ≥355 ≥470 ≥20
STKM13A ≥215 ≥370 ≥30
STKM13B ≥305 ≥440 ≥20
STKM13C ≥380 ≥510 ≥15
STKM14A ≥245 ≥410 ≥25
STKM14B ≥355 ≥500 ≥15
STKM14C ≥410 ≥550 ≥15

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

Grade and Designation

The grade and designation of the tube shall be as given as follows table.

Grade Designation
Grade 11 A STKM 11A
Grade 12 A STKM 12A
B STKM 12B
C STKM 12C
Grade 13 A STKM 13A
B STKM 13B
C STKM 13C
Grade 14 A STKM 14A
B STKM 14B
C STKM 14C
Grade 15 A STKM 15A
C STKM 15C
Grade 16 A STKM 16A
C STKM 16C
Grade 17 A STKM 17A
C STKM 17C
Grade 18 A STKM 18A
B STKM 18B
C STKM 18C
Grade 19 A STKM 19A
C STKM 19C
Grade 20 A STKM 20A

The sub classification letter symbols A, B and C are used to indicate distinction of method of manufacturing the tube, cold working process, heat treatment, etc.

World standard Comparative with JIS G3445
NUBER GRADE NUBER GRADE NUBER GRADE NUBER GRADE
D 3517 Grade 11 A STKM 11 A A513 MT1010 G-3445 STKM11A
A519 MT1010
Grade 12A STKM 12 A A513 MT1015 STKM12A 980 CDS-3
A519 MT1015
Grade 12 B STKM 12 B STKM12B
Grade 12C STKM 12C A512 MT1015 STKM12C
A513
Grade 13 A STKM 13 A A512 MT  1025 STKM13A
A513 MTX1025
A519  MT  1025
Grade13B STKM 13 B STKM13B 980 CDS-4
Grade13 C STKM 13 C STKM13C
Grade14 A STKM 14 A A513 MT1030 STKM14A 1717 CDS-103
A519 MT1030
Grade14 B STKM 14 B STKM14B
Grade14 C STKM 14 C STKM14C
Grade15 A STKM 15 A A513 MT1033 STKM15A 1717 CDS-105
Grade15 C STKM 15 C STKM15C
Grade16 A STKM 16 A A519 MT1040 STKM16A 980 CDS-5
Grade16 C STKM 16 C STKM16C
Grade17 A STKM 17 A A519 MT1050 STKM17A 980 CDS-7
1717 CDS-107
Grade17 C STKM 17 C STKM17B
Grade18 A STKM 18 A A519 MT1524 STKM18A 980 CDS-9
Grade18 B STKM 18 B STKM18B
Grade18 C STKM 18 C STKM18C
Grade19 A STKM 19 A
Grade19 C STKM 19 C
Grade20 A STKM 20 A

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.

Tolerance on Outside Diameter
Division Tolerances on outside diameter
No. 1 Under 50mm ±0.5mm
50mm or over ±1%
No. 2 Under 50mm ±0.25mm
50mm or over ±0.5%
No. 3 Under 25mm ±0.12mm
25mm or over to and excl. 40mm ±0.15mm
40mm or over to and excl. 50mm ±0.18mm
50mm or over to and excl. 60mm ±0.20mm
60mm or over to and excl. 70mm ±0.23mm
70mm or over to and excl. 80mm ±0.25mm
80mm or over to and excl. 90mm ±0.30mm
90mm or over to and excl.100mm ±0.40mm
100mm or over ±0.50%
Tolerance of Thickness
Division Tolerances on wall thickness
No. 1 Under 4mm
+0.6mm
-0.5mm
4mm or over
15%
-12.50%
No. 2 Under 3mm
±0.3mm
3mm or over
JIS G3445 STKM11A

Protection and Packing:

Packed in wooden box or bundles protected with plastic paper, and suitably protected for sea-worthily delivery or as requested.

The tubes shall be delivered with a temporary corrosion protection. The type of protection shall be at the discretion of the manufacturer.



Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.


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