DIN17175

DIN 17175 steel pipes are used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high temperature and high-pressure devices. DIN 17175 alloy steel pipe is only a large class, it has many classifications.

We mainly produce DIN 17175 ST35.8, DIN 17175 ST45.8 and 10CrMo910 steel pipe. This alloy steel pipe is only a large class, it has many classifications.

This standard applies to seamless tubes 1) including tubes for headers of heat-resistant steels according to Table 1 which are used in the construction of boilers, pipe-lines, pressure vessels and equipment for service up to 600∩ and at simultaneous high pressures, where the tototal stress and the relevant scaling conditions can raise or lower the temperature limit.

Designation and ordering

5.1. The code numbers for the grades of steel were formed in accordance with Sections 2.1.1.1. and 2.1.2.2 of the Explanations to DIN Normenheft 3, and the material numbers according to DIN 17 007 Part 2.

5.2. The code number or the material number for the steel grade shall be appended to the symbol for the product according to the following examples :

Example 1:

Designation of a seamless steel tubes of 38mm outside diameter and 2.6mm wall thickness according to DIN 2448 of steel St 35.8, material number 1.0385 :

Tabe DIN 2448 – sT 35.8 x 2.6

or Tabe DIN 2448 – 1.0305 – 38 x 2.6

5.3. The order shall not only specify the designation according to Section 5.2 but also in every case the desired total length and the desired acceptance inspection certificate and for unalloyed steel tubes also the steel grade. In addition, further details in compliance with the other Sections marked with a dot(≤) can be agreed at the time of ordering.

DIN 8528 Part 1 Weldability; metallic materials, definitions

Chemical compositions (%) of DIN 17175

Grade	C	Si	Mn	P	S	Cr	Mo
St35.8	≤0.17	0.10-0.35	0.40-0.80	≤0.040	≤0.040	/	/
St45.8	≤0.21	0.10-0.35	0.40-1.20	≤0.040	≤0.040	/	/
15Mo3	0.12-0.20	0.10-0.35	0.40-0.80	≤0.035	≤0.035	/	0.25-0.35
13CrMo44	0.10-0.18	0.10-0.35	0.40-0.70	≤0.035	≤0.035	0.70-1.10	0.46-0.65
10CrMo910	0.08-0.15	≤0.50	0.40-0.70	≤0.035	≤0.035	0.20-0.25	0.90-1.20

Mechanical properties of DIN17175

Grade	Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation(%)
St35.8	≥235	360-480	25
St45.8	≥255	410-530	21
15Mo3	≥275	450-600	20
13CrMo44	≥290	440-590	20
10CrMo910	≥280	450-600	18

DIN 17175-79 seamless steel tubes for elevated temperatures

Sections marked with a dot(●) contain details on agreements which shall, or may be, reached at the time of ordering.

Grade	Mfg. Process	C	Si	Mn	P	S	Ni	Cr	Mo	Others
St35.8	S	0.17Max	0.10-0.35	0.40-0.80	0.040Max	0.040Max	-	-	-	-
St45.8	S	0.21Max	0.10-0.35	0.40-1.20	0.040Max	0.040Max	-	-	-	-
17Mn4	S	0.14-0.20	0.20-0.40	0.90-1.20	0.040Max	0.040Max	-	0.30Max	-	-
19Mn5	S	0.17-0.22	0.30-0.60	1.00-1.30	0.040Max	0.040Max	-	0.30Max	-	-
15Mo3	S	0.12-0.20	0.10-0.35	0.40-0.80	0.035Max	0.035Max	-	-	0.25-0.35	-
13CrMo910	S	0.10-0.18	0.10-0.35	0.40-0.70	0.035Max	0.035Max	-	0.70-1.10	0.45-0.65	-
10CrMo910	S	0.08-0.15	0.50Max	0.40-0.70	0.035Max	0.035Max	-	2.00-2.50	0.90-1.20	-
14MoV63	S	0.10-0.18	0.10-0.35	0.40-0.70	0.035Max	0.035Max	-	0.30-0.60	0.50-0.70	V : 0.22-0.32
X20CrMoV121	S	0.17-0.23	0.50Max	0.40-0.70	0.030Max	0.030Max	0.30-0.80	10.00-12.50	0.80-1.20	V : 0.25-0.35

Grade	Materia number	Tensile Test MPa or N/mm2			Remaks(Similar to JIS)	Possibility Temperature
		Min Yield point		Tensile Strength
		t 16Max	16
St35.8	1.0305	235	225	360-480	Impact Test at Room Temp.kgf-m
					(STPT38)
St45.8	1.0405	-	245	410-530	23.5(STPT410, STB410)
17Mn4	1.0481	-	275	460-580	22.8
19Mn5	1.0482	-	315	510-610	23.5(STB52)
15Mo3	1.5415	275	275	450-600	23.5
13CrMo910	1.7335	295	295	440-590	23.2(STPA22, STBA22)
10CrMo910	1.738	285	285	450-600	23.2(STPA24, STBA24)
14MoV63	1.7715	325	325	460-610	24.2
X20CrMoV121	1.4922	490	490	690-850	23.5

Table1. Summary of heat-resisting steels for seamless tubes, their chamicalcomposition (cast analysis) and colour designation of tubes

Code number	Material number	C	Si	Mn	P	S	Cr	Mo	Ni	V	Colourdesignation 1)
St 35.8	1.0306	÷ 0.17	0.10 to 0.35 2)	0.40 to 0.80	0.04	0.04					white
St 45.8	1.0406	÷ 0.21	0.10 to 0.35 2)	0.40 to1.20	0.04	0.04					yellow
17Mn 4 3)	1.0481 3)	0.14 to 0.20	0.20 to 0.40	0.90 to 1.20	0.04	0.04	÷ 0.30				red
											and
											black
19Mn 5 3)	1.0482 3)	0.17 to 0.22 4)	0.30 to 0.60	1.00 to 1.30	0.04	0.04	÷ 0.30				yellow
											and
											brown
15Mn 3	1.5415	0.12 to 0.20 4)	0.10 to 0.35	0.40 to 0.80	0.035	0.035		0.25 to 0.35			yellow
											and
											carmine
											red
13CrMo 4 4	1.7335	0.10 to 0.18 4)	0.10 to 0.35	0.40 to 070	0.035	0.035	0.70 to 1.10	0.45 to 0.65			yellow
											and
											shades or
											silver
10CrMo 9 10	1.738	0.08 to 0.15	÷ 0.50	0.40 to 070	0.035	0.035	2.00 to 2.50	0.90 to 1.20			red
											and
											green
14MoV 6 3	1.7715	0.10 to 0.18	0.10 to 0.35	0.40 to 0.70	0.035	0.035	0.30 to 0.60	0.50 to 0.70		0.22 to 0.32	red
											and
											shades
											of silver
X20CrMoV 12 1	1.4922	0.17 to 0.23	÷ 0.50	÷ 1.00	0.03	0.03	10.00 to 12.50	0.80 to 1.20	0.30 to 0.80	0.25 to 0.35	blue

Element	Limits quoted in cast analysis according to Table 1 Weight %	Permissible deviation 1) of sample analysis from the limits quoted in the cast analysis according to Table 1 Weight %
C	÷0.24	【 0.02
Si	÷0.35	【 0.03
	>0.35÷0.60	【 0.04
Mn	÷1.00	【 0.04
	>1.00÷1.30	【 0.05
P S	÷0.040	【 0.010
Cr	÷0.040÷2.00	【 0.05
	>2.00÷2.50	【 0.07
	∶1.00÷12.50	【 0.15
Mo	÷0.30	【 0.03
	>0.30 ÷1.20	【 0.04
Ni	0.30÷0.80	【 0.03
V	0.22÷0.35	【 0.03

Table 3. Scope of tests for seamless tubes in both quality grades and authority for the execution of the testings.

No	Extent of testing	According to Section	Quality grade I	Quality grade II	Authority for the execution of the test 1)
1	Tensile test 2)	8.4.3	on two tubes per batch from the first two batches, on one tube from each subsequent batch	on two tubes per batch from the first two batches, on one tube from each subsequent batch	S.A.
2	Notch impact/bending test 3)	8.4.4	on tubes according to No.1	on tubes according to No.1	S.A.
3	Ring test 3)	8.4.6	on one end of the tubes acc to No.1	depending on the diameter (see Section 8.4.6) on 20% of the cut or part-lengths at one end or on 100% of the cut or part-lengths at both ends if necessary though also at one end, see Section 8.4.6.2.2.	M.W.
4	Non-destructive test	8.4.7		all tubes	M.W.
5	Visual inspection of tube surface	8.4.8	all tubes	all tubes	S.A.
6	Gauging	8.4.9	all tubes	all tubes	M.W.
7	Leakage test	8.4.10	all tubes	all tubes	M.W.
8	Grade identification test	8.4.11		all alloy tubes	M.W
9	Special tests 4) No. 9, No. 10	8.4.2	subject to agreement	subject to agreement.	M.W
10	Hot tensile test	8.4.5	unless otherwise agreed 1 sample per cast and size or 1 sample per cast and annealed batch (heattreated batch)	unless otherwise agreed 1 sample per cast and size or 1 sample per cast and annealed batch (heattreated batch)	S.A.

1) S.A = subject to agreement; M.W. = Manufacturing works.
2) 1 specimen or 1 set of specimens suffices for batch sizes of up to 10 tubes.
3) The particulars on the size range governing the application of these test in Table 14 shall be complied with.
4)≤ Special tests shall be carried out only after agreement between manufacturer and customer.