Din2391/c St35 St37.4 St52.4 Steel Precision Seamless Pipe

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DIN2391/C St35 St37.4 St52.4 Steel Precision Seamless Pipe

This Standard defines the technical delivery conditions for seamless precision steel tubes according to DIN 2391 Part 2 which are made from the steel grades listed in section 5.
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.

DIN2391/C St35 St37.4 St52.4 Steel Precision Seamless Pipe

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