Application: Boiler Tubes

At the heart of our pedigree and experience is the production of boiler tubes, using the latest production technologies to ensure excellence of quality is combined with innovation in materials. 

As today's conventional power plants evolve in terms of operating efficiencies and environment controls so the operating environments become ever more challenging.  

Advanced ultra supercritical power plants with operating temperatures of 700 ºC (1292 ºF) and pressures > 350 bar demand materials which demonstrate high temperature creep strength, enabling the improved optimisation of wall thickness.  

Our boiler tubes size range of cold finished seamless tubes is complemented by our extensive range of heat exchanger and instrumentation sizes.

Product: Boiler Tubes

OD range 

mm 

Inch 

min 

331.3

max 

763

WT range 

mm 

Inch 

min 

20.08

max 

160.63

Equivalent grades according to national and international standards

MST
designation
GermanyUSAFranceGreat BritainJapan
 W-NrDINUNSASTMDesignationNFADesignationBSDesignationJIS
DMV 304H1.494817459S30409A 376 1)Z 6 CN 19-1049-214304 S 513059304 HTP3459
DMV 304HCu1.4907 Code Case 2328-1      
DMV 304N1.494917459S30451A 376 1)  304 S 513059  
DMV 316H1.491917459S31609A 376 1)Z 6 CND 17-12B49-214316 S 523059316 HTP3459
DMV 321H1.494117459S32109A 376 1)Z 6 CNT 18-12B49-214321 S 513059321 HTP3459
DMV 347H1.455017458S34700A 376 1)Z 6 CNNb 18-1049-218347 S 593059347 HTP3459
DMV 347HFG1.4908 Code Case 2159-2      
DMV 49101.491017459S31653A 376 1)Z 6 CN 19-1049-214316 S 513059  
DMV 310N1.4952 S31042A 213      
DMV 800H1.495817459N08810B 407Z 8 NC 32-2135-578NA 153074NOF800 H 
DMV 800HT1.495917459N08811B 407Z 8 NC 32-2135-578NA 153074NOF800 H 
DMV AC661.4877 S33228A 213      
DMV 600H2.481617751N06600B 167Z 8 NC 75 15 NA 14(H)30743074NOF600H 
DMV 617 / DMV 617 mod.2.4663 N06617B 622      

1) also ASTM A 213, ASTM A 312, ASME

Shot Peening

Shot Peening is a cost-effective technique to refine austenitic superheater and reheater tubes, on grades like DMV 304HCu, DMV 347, DMV 347HFG and DMV 4910.  

Treating the inner surface of the tube with particles of its own grade, creates a cold shaped, fine grained layer. While in use inside a power plant at temperatures about 570 °C (1058 °F), a permanent and dense layer of chromium oxide is formed that steadily protects the tube from its inside. 

Shot peened tubes can be used in power plants at  higher temperatures  and offer an  increased service life, compared to other superheater or reheater tubes. That makes it an alternative to products in price volatile chrome and nickel alloys. 

HRSG Heat Recovery Steam Generator Tubes

Our heat recovery steam generator tubing is at the heart of the process for the continual drive towards improving thermal operating efficiencies of today’s power plants. 

With straight lengths up to 30 m (98 ft) long we offer stainless and nickel alloys suitable for environments demanding high thermal fatigue, creep and corrosion fatigue properties.

Creep Properties

MST
designation
Heat treatment conditionTemperature (°C)
Creep strength (MPa) after …
  10.000 hours100.000 hours200.000 hours
DMV 304Hsolution annealed550
250
600
132
650
87
700
55
750
(34)
 550
192
600
89
650
52
700
28
750
(15)
 550
176
600
78
650
43
700
22
  
DMV 304HCusolution annealed 600
240
650
160
700
101
750
61
  600
182
650
116
700
68
750
37
       
DMV 304Nsolution annealed550
230
600
160
650
100
550
178
  550
178
600
114
650
64
700
30
        
DMV 316Hsolution annealed550
250
600
175
650
111
700
65
  550
175
600
120
650
69
700
34
        
DMV 321Hsolution annealed550
230
600
160
650
100
700
60
  700
60
600
100
650
62
700
35
  500
150
600
90
650
54
700
29
  
DMV 347Hsolution annealed 600
115
650
70
700
45
750
28
800
(17)
 600
65
650
39
700
22
750
13
800
(8)
      
DMV 347HFGsolution annealed 600
215
650
142
700
90
750
53
  600
159
650
100
700
58
750
30
       
DMV 4910solution annealed550
290
600
205
650
135
700
84
750
52
800
33
550
220
600
141
650
83
700
52
750
34
800
20
550
(200)
600
(122)
650
(73)
700
(42)
750
(28)
800
(17)
DMV 310Nsolution annealed 600
284
650
171
700
108
750
64
  600
184
650
114
700
66
750
39
       
DMV 800Hsolution annealed550
225
600
140
650
97
700
69
  550
160
600
95
650
63
700
44
  550
(143)
600
(83)
650
(55)
700
(38)
  
DMV 800HTsolution annealed750
57
800
41
850
28
900
18
950
12
1,000
7.9
750
35
800
25
850
17
900
9.9
950
6.2
1.000
(4.0)
750
(30)
800
(21)
850
(13)
900
(8.0)
950
(4.5)
1.000
(3.2)
DMV AC66solution annealed700
80
750
46
800
24
900
10
950
6
1,000
(3.5)
700
52
750
27
800
16
900
5
950
3
1.000
(1.5)
      
DMV 617solution annealed600
260
700
123
800
65
900
30
950
18
1,000
10
600
190
700
95
800
43
900
16
950
8.5
1.000
(4.5)
      
DMV 600Hsolution annealed600
138
700
163
800
29
850
17
900
13
 600
97
700
42
800
17
850
9.5
900
7.0
       
DMV 617 mod.solution annealed600
260
650
170
700
123
750
90
  600
190
650
125
700
95
750
65
        

An example of how to read the table: creep strength of DMV AC66 after 10.000 hours at 750 °C is 46 MPa
Values in brackets are extrapolated.

Typical Chemical Composition1)

MST
designation
 CSiMnPSCrNiMoNOthers
DMV 304Hmin.
max.
0.04
0.08

0.75

2.0

0.035

0.015
17.0
19.0
10.0
12.0
   
DMV 304HCumin.
max.
0.07
0.13

0.30

1.0

0.040

0.010
17.0
19.0
7.5
10.5
 0.05
0.12
Nb(Cb): 0.3-0.6; Cu: 2.5-3.5;
Al: 0.003-0.030; B: 0.001-0.010
DMV 304Nmin.
max.

0.04

0.75

2.0

0.035

0.015
17.0
19.0
9.5
11.5
0.20
0.50
0.10
0.18
 
DMV 316Hmin.
max.
0.04
0.08

0.75

2.0

0.035

0.015
16.0
18.0
12.0
14.0
2.0
2.5
  
DMV 321Hmin.
max.
0.04
0.10

0.75

2.0

0.035

0.015
17.0
18.5
9.5
11.5

0.60
 Ti: 5xC - 0.80;
B: 0.0015 - 0.0050
DMV 347Hmin.
max.
0.04
0.08

0.75

2.0

0.035

0.015
17.0
19.0
9.0
12.0
  Nb: 10xC - 1.0
DMV 347HFGmin.
max.
0.06
0.10

0.75

2.0

0.040

0.030
17.0
20.0
9.0
13.0
  Nb(Cb) + Ta: 8xC - 1.0
DMV 4910min.
max.

0.04

0.75

2.0

0.035

0.015
16.0
18.0
12.0
14.0
2.0
2.8
0.10
0.18
B: 0.0015 - 0.0050
DMV 310Nmin.
max.
0.04
0.10

0.75

2.0

0.030

0.030
24.0
26.0
17.0
23.0
 0.15
0.35
Nb: 0.20 - 0.60
DMV 800Hmin.
max.
0.05
0.10

0.70

1.5

0.015

0.010
19.0
22.0
30.0
34.0
  Al: 0.25 - 0.65;
Ti: 0.25 - 0.65; Co: max. 0.5
DMV 800HTmin.
max.
0.06
0.10

0.70

1.5

0.015

0.010
19.0
22.0
30.0
34.0
  Al: 0.25 - 0.65;
Ti: 0.25 - 0.65; Co: max. 0.5
DMV AC66min.
max.
0.04
0.08

0.30

1.0

0.015

0.010
26.0
28.0
31.0
33.0
  Nb: 0.6 - 1.0;
Ce: 0.05 - 0.10; Al: max. 0.025
DMV 600Hmin.
max.
0.06
0.08

0.50

1.0

0.015

0.015
14.0
17.0

72.0
  Fe: 6.0 - 10.0
DMV 617min.
max.
0.05
0.10

0.70

0.7

0.012

0.008
20.0
23.0

Remainder
8.0
10.0
 Co: 10.0 - 13.0;
Ti: 0.2 - 0.5; Al: 0.6 - 1.5

1) All figures in weight percentage. In case of order, the limits of the order specification will apply.

Mechanical Properties At Elevated Temperatures

MST designationHeat treatment conditionRp0.2 (MPa) min. at (°C)Rp1.0 (MPa) min. at (°C)
  100 200300400500550600650100200300400500550600650
DMV 304Hsolution annealed15712710898888378 191157137127118113108 
DMV 304HCusolution annealed205180170160150145140 230205195185175170165 
DMV 304Nsolution annealed185150130120110105100 220175150140130125120 
DMV 316Hsolution annealed17714712711810810398 211177157147137132128 
DMV 321Hsolution annealed162142132123113108103 201181172162152147142 
DMV 347Hsolution annealed177157136125119118  211186167156149147  
DMV 347HFGsolution annealed182163152143136134131126217198187173161159156151
DMV 4910solution annealed205170148134127124121 240200178164157154151 
DMV 310Nsolution annealed240205190180170165160160265230210200190185180180
DMV 800Hsolution annealed1401159585807575 1601351151051009595 
DMV 800HTsolution annealed1401159585807575 1601351151051009595 
DMV AC66solution annealed160140120105959090 190170145130115110110 
DMV 600Hsolution annealed170160150150            
DMV 617 / DMV 617 mod.solution annealed270230220210200195190 300260250240225220210 

 

Physical Properties

MST designationDensity
(g/cm3)
Modulus of plastic elasticity GPaCoefficient of thermal mean linear expansion (10-6/K) between 20°C and (°C)Thermal conductivity W/mK atSpecific heat J/kgK
at
Specific
electrical resistivity 10 -6  
Ωm
  201002004007001.0001002004007001.00020°C20°Cat 20°
DMV 304H7.80198192183167142 16.316.917.818.7 174500.70
DMV 304HCu7.80189182174156134 16.417.117.818.6 15  
DMV 304N7.81198192183167142 16.316.917.818.7 174500.70
DMV 316H7.88198192183167142 16.316.917.818.7 164500.77
DMV 321H7.80198192183167142 16.316.917.818.7 174500.70
DMV 347H7.83200     16.017.018.0  155000.73
DMV 347HFG7.83200190185170145 16.316.917.818.7 14  
DMV 49107.91198192183167142 16.316.917.818.7 164500.77
DMV 310N7.83193191184167144 13.415.617.017.9 12  
DMV 800H7.9719719118417014812715.416.016.817.919.0124600.99
DMV 800HT7.9819719118417014812715.416.016.817.919.0124600.99
DMV AC667.9819119517916614411914.016.019.023.028.0124450.96
DMV 600H8.4721421420919417214313.714.114.815.816.9154551.03
DMV 617 / DMV 617 mod.8.5721521521119216914312.4  15.116.9104201.22