Precision Tube

Type: Seamless Material: Carbon Steel Usage: Hydraulic/Automobile Pipe Origin: China Technique: Cold Drawn Surface Treatment: Oiled Section Shape: Round HS Code: 7304900000 Standard: DIN 2391
Steel grade: ST35, ST37, ST37.4, ST45, ST52, ST52.4
Size: OD (4-320mm) X WT (0.5-15mm)
Delivery condition: NBK(+N), GBK(+A), BK(+C), BKW(+LC), BKS(+SR).
Application: Used in hydraulic system, automobile, locomotive and military industry.
 

OD Tolerance	4-30mm	31-40mm	41-50mm	51-60mm	61-70mm	71-80mm	81-90mm	91-100mm
	±0.08mm	±0.15mm	±0.20mm	±0.25mm	±0.30mm	±0.30mm	±0.40mm	±0.45mm
WT Tolerance	±10%

 

Chemical Composition
Standard	Grade	C	Si	Mn	P  max	S  max
DIN2391-94	St35	≤0.17	≤0.35	≥0.4	0.025	0.025
DIN 1630	St37.4	≤0.17	≤0.35	≥0.35	0.04	0.04
DIN2391-94	St45	≤0.21	≤0.35	≥0.4	0.025	0.025
DIN2391-94	St52	≤0.22	≤0.55	≤1.6	0.025	0.025
DIN 1630	St52.4	≤0.22	≤0.55	≤1.6	0.04	0.035

 

Mechanical Properties.
	Cold Drawn(Mandatory)		Cold drawn(Soft)		Cold Drawn and Stress Release			Anneal		Normalizing
	BK 1 )		BKW 1 )		(BKS)			(GBK) 1 )		(NBK) 1 )
Steel grade	Tensile	Elongation	Tensile	Elongation	Tensile	Yield point	Elongation	Tensile	Elongation	Tensile	Yield point	Elongation
	N/mm 2	%	N/mm 2	%	N/mm 2	N/mm 2	%	N/mm 2	%	N/mm 2	N/mm 2	%
St35	480	6	420	10	420	315	14	315	35	340~470	235	25
St37.4	480	6	420	10	420	315	14	315	25	350~480	235	25
St45	580	5	520	8	520	375	12	390	21	440~570	255	21
St52	640	4	580	7	580	420	10	490	22	490~630	355	22
St52.4	--	--	--	--	--	--	--	--	--	500~650	355	21

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