Din2391/c Seamless Precision Steel Pipes

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Basic Info

Product Description

DIN2391/C Seamless Precision Steel Pipes

Field of application

This Standard defines the technical delivery conditions for seamless precision steel tubes according to DIN 2391 Part 1 which are made from the steel grades listed in section 5.

Tubes according to this Standard are mainly used where accuracy to dimension and, possibly, small wall thicknesses and good surface condition are required

Chemical Compositions

Grade	Mfg. Process	Chemical composition(%)
		C	Si	Mn	P	S	Ni	Cr	Mo	Others



St30Si	S	0.10Max	0.30Max	0.55Max	0.040Max	0.040Max	-	-	-	-



St30A1	S	0.10Max	0.05Max	0.55Max	0.040Max	0.040Max	-	-	-	Al deoxydized



St35	S	0.17Max	0.35Max	0.40Max	0.050Max	0.050Max	-	-	-	-



St45	S	0.21Max	0.35Max	0.40Max	0.050Max	0.050Max	-	-	-	-



St52	S	0.22Max	0.55Max	1.60Max	0.050Max	0.050Max	-	-	-	-

Mechanical Properties(Mpa)

Grade	Material number	Tensile Test MPa or N/mm²		Remaks (Similar to JIS)	Possibility Temperature
Grade	Material number	Min Yield point	Tensile Strength	Remaks (Similar to JIS)	Possibility Temperature
St30Si	1.0211	-	400Min	(STKM11)
		-	355Min
		-	285Min
		215	295~420
St30Al	1.0212	-	400Min	(STKM11)
		-	355Min
		-	285Min
		215	295~420
St35	1.0308	-	440Min	(STC38)
		-	370Min
		-	315Min
		235	340~470
St45	1.0408	-	540Min	(STKM13)
		-	470Min
		-	390Min
		255	440~570
St52	1.0580	-	590Min	(STKM19)
		-	540Min
		-	490Min
		350	490~630

Delivery Condition

Term	Symbol	Explanation
Cold-finished/hard (cold-finished as-drawn)	BK	No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)	BKW	After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed	GBK	After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized	NBK	The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

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