DIN 17175 ST45.8 Seamless Steel Tubes

Short Description:

DIN 17175 St45.8 seamless steel pipes can be produced by hot rolling, cold rolling, hot pressing, hot drawing or cold drawing. DIN 17175 St45.8 seamless steel pipes can be used in the manufacture of steam boilers, pipes, pressure vessels and instrumentation operating at up to 600°C and high temperatures.

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DIN 17175 St45.8 Seamless Steel Tubes Quick Details

Manufacturing: Seamless Process.
External dimensions: 14mm-711mm.
Wall thickness: 2mm-60mm.
Length: Fixed length (6m, 9m, 12m, 24m) or normal length (5-12m).
Ends: Flat, Beveled, Stepped.

Manufacturing Method
DIN 17175 St45.8 seamless steel pipes can be produced by hot rolling, cold rolling, hot pressing, hot drawing or cold drawing.
Steel pipes can be smelted in an open hearth or electric furnace according to the oxygen blow method, and all steel should be cast statically.

Availability
17175 St45.8 seamless steel pipe will be delivered with proper heat treatment. Heat treatment includes:
- Normalization.
- Annealing.
- Tempering; from the quenching temperature, it is not cold, but tempered.
- Adjust mass by isothermal transformation method.

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DIN 17175 St45.8 Heat Treatment Temperatures for Seamless Steel Tubes

Steel Grade		Thermal processing ℃	Normalizing℃	Tempering
Grade	Material number	Thermal processing ℃	Normalizing℃	Quenching temperature ℃	Tempering temperature ℃
St45.8	1.0405	1100 to 850°C	870-900	–	–

Chemical Composition of DIN 17175 St45.8 Seamless Steel Tubes

Standard:DIN 17175	Grade	Chemical composition(%)
	Grade	C	Si	Mn	P、S	Cr	Mo
	St45.8	≤0.21	0.10-0.35	0.40-1.20	≤0.030	/	/

Mechanical Property of DIN 17175 St45.8 Seamless Steel Tubes

Grade	Tensile Strength(MPa)	Yield Strength(MPa)	Elongation(%)
St45.8	410-530	≥255	≥21

Original Material Test

A thin sheet should be taken at the top end of each round or square bar ingot for a pickling test to determine if the top end is adequately cut. Ultrasonic testing can also be performed on the shrinkage hole as selected by the supplier.

Test:
Chemical composition verification test
hydrostatictest
Tensile test
Notched impact test
Yield strength test
Ring test
Nondestructive testing

Tube Flag
All steel pipes submitted for testing and acceptance shall be marked on the left and right sides of the pipe end at 300 mm. The mark is usually a number. Thin-walled tubes can also be used in other forms.

Marking and ordering
The steel grade or material number should be written to the abbreviation of the product as shown in the following example:
Example 1:
A DIN 17175 outer diameter 63mm, wall thickness 2.5 mm mm steel grade ST45.8 material, number 1.03 0 5 seamless steel pipe whose name is written: steel pipe DIN 17175-ST45.8 - 63 × 2.5 or steel pipe DIN 17175 -1.0305 - 63 × 2 . 5.

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