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.

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Product: Boiler Tubes

OD rangemmInch
min33.01.3
max76.03.0
WT rangemmInch
min2.00.08
max16.00.63

 

Equivalent Grades According To National And International Standards

DMV
designation		GermanyUSAFranceGreat BritainJapan
 W-NrDINUNSASTMDesignationNFADesignationBSDesignationJIS
DMV 304H1.494817459S30409A 376 1)Z 6 CN 19-1049-214304 S513059304 HTP3459
DMV 304HCu1.4907 Code Case 2328-1      
DMV 304N1.494917459S30451A 376 1)  304 S513059  
DMV 316H1.491917459S31609A 376 1)Z 6 CND 17-12B49-214316 S523059316 HTP3459
DMV 321H1.494117459S32109A 376 1)Z 6 CNT 18-12B49-214321 S513059321 HTP3459
DMV 347H1.455017458S34700A 376 1)Z 6 CNNb 18-1049-218347 S593059347 HTP3459
DMV 347HFG1.4908 Code Case 2159-2      
DMV 49101.491017459S31653A 376 1)Z 6 CN 19-1049-214316 S513059  
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. 

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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

DMV
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)

DMV
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

DMV 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

DMV 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