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.

Standards: JIS G3445

Size (mm):

• Outer Dimensions: 19.05mm - 114.3mm
• Wall Thickness:2.0mm - 14 mm
• Length: max 16000mm

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

The main products of steel / steel grade:

• 圣KM11A, STKM12(A,B,C)
• 圣KM13(A,B,C)
• 圣KM14(A,B,C)

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

Painting: as requested.

Chemical Compositions(%):

研究生e	C	Si	Mn	P	S
圣KM11A	≤0.12	≤0.35	≤0.60	≤0.040	≤0.040
圣KM12A	≤0.20	≤0.35	≤0.60	≤0.040	≤0.040
圣KM12B	≤0.20	≤0.35	≤0.60	≤0.040	≤0.040
圣KM12C	≤0.20	≤0.35	≤0.60	≤0.040	≤0.040
圣KM13A	≤0.25	≤0.35	0.30-0.90	≤0.040	≤0.040
圣KM13B	≤0.25	≤0.35	0.30-0.90	≤0.040	≤0.040
圣KM13C	≤0.25	≤0.35	0.30-0.90	≤0.040	≤0.040
圣KM14A	≤0.30	≤0.35	0.30-1.00	≤0.040	≤0.040
圣KM14B	≤0.30	≤0.35	0.30-1.00	≤0.040	≤0.040
圣KM14C	≤0.30	≤0.35	0.30-1.00	≤0.040	≤0.040

Appearance

• 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.
• The surface finish of the tubes, when especially specified shall be agreed upon by the purchaser and the manufacturer.

Mechanical Properties:

研究生e	Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation (%)
圣KM11A	\	≥290	≥35
圣KM12A	≥175	≥340	≥35
圣KM12B	≥275	≥390	≥25
圣KM12C	≥355	≥470	≥20
圣KM13A	≥215	≥370	≥30
圣KM13B	≥305	≥440	≥20
圣KM13C	≥380	≥510	≥15
圣KM14A	≥245	≥410	≥25
圣KM14B	≥355	≥500	≥15
圣KM14C	≥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.

研究生e and Designation

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

研究生e		Designation
研究生e 11	A	圣KM 11A
研究生e 12	A	圣KM 12A
	B	圣KM 12B
	C	圣KM 12C
研究生e 13	A	圣KM 13A
	B	圣KM 13B
	C	圣KM 13C
研究生e 14	A	圣KM 14A
	B	圣KM 14B
	C	圣KM 14C
研究生e 15	A	圣KM 15A
	C	圣KM 15C
研究生e 16	A	圣KM 16A
	C	圣KM 16C
研究生e 17	A	圣KM 17A
	C	圣KM 17C
研究生e 18	A	圣KM 18A
	B	圣KM 18B
	C	圣KM 18C
研究生e 19	A	圣KM 19A
	C	圣KM 19C
研究生e 20	A	圣KM 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	研究生e 11 A	圣KM 11 A	A513	MT1010	G-3445	圣KM11A	–	–
			A519	MT1010
	研究生e 12A	圣KM 12 A	A513	MT1015		圣KM12A	980	CDS-3
			A519	MT1015
	研究生e 12 B	圣KM 12 B	–	–		圣KM12B	–	–
	研究生e 12C	圣KM 12C	A512	MT1015		圣KM12C	–	–
			A513
	研究生e 13 A	圣KM 13 A	A512	MT 1025		圣KM13A	–	–
			A513	MTX1025
			A519	MT 1025
	研究生e13B	圣KM 13 B	–	–		圣KM13B	980	CDS-4
	研究生e13 C	圣KM 13 C	–	–		圣KM13C	–	–
	研究生e14 A	圣KM 14 A	A513	MT1030		圣KM14A	1717	CDS-103
			A519	MT1030
	研究生e14 B	圣KM 14 B	–	–		圣KM14B	–	–
	研究生e14 C	圣KM 14 C	–	–		圣KM14C	–	–
	研究生e15 A	圣KM 15 A	A513	MT1033		圣KM15A	1717	CDS-105
	研究生e15 C	圣KM 15 C	–	–		圣KM15C	–	–
	研究生e16 A	圣KM 16 A	A519	MT1040		圣KM16A	980	CDS-5
	研究生e16 C	圣KM 16 C	–	–		圣KM16C	–	–
	研究生e17 A	圣KM 17 A	A519	MT1050		STKM17A	980	CDS-7
							1717	CDS-107
	研究生e17 C	圣KM 17 C	–	–		圣KM17B	–	–
	研究生e18 A	圣KM 18 A	A519	MT1524		圣KM18A	980	CDS-9
	研究生e18 B	圣KM 18 B	–	–		圣KM18B	–	–
	研究生e18 C	圣KM 18 C	–	–		圣KM18C	–	–
	研究生e19 A	圣KM 19 A	–	–		–	–	–
	研究生e19 C	圣KM 19 C	–	–		–	–	–
	研究生e20 A	圣KM 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

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.