DIWA 373 (EN 1.6368)

DIWA 373 (EN 1.6368)

DIWA 373 (EN 1.6368) introduction

DIWA 373 is a weldable fine grained steel which is characterized by high yield strength at elevated tem-
peratures. DIWA 373 is produced using basic oxygen steelmaking process. Its properties are achieved by normalizing and tempering or, for thicknesses exceeding 100 mm by normalizing and tempering or water
quenching and tempering.

DIWA 373 is used as plate or formed part for boilers, pressure vessels, piping and other fabricated parts
operating at temperatures up to 500 °C.

DIWA 373 / 15NiCuMoNb5-6-4, Material No. 1.6368, is standardized in EN 10028, part 2, for thicknesses
up to 200 mm and qualified in accordance with VdTÜV material data sheet 377/1 for the application range
of the AD 2000-Merkblätter in thicknesses up to 180 mm. This data sheet applies to heavy plates with thicknesses from 6 to 250 mm.

Equivalent material: EN 15NiCuMoNb5-6-4, DIN 15NiCuMoNb5-6-4, EN 1.6368, DIN 1.6368

DIWA 373 (EN 1.6368) general

Property Temperature Value Testing Standard Comment
Charpy impact energy, V-notch -20 °C Charpy impact energy, V-notch of 27 J - *The specified values are minimum values for the average of 3 tests. No individual value is to be less than 70 % of the specified minimum. For plate thickness below 11 mm the test can be carried out on Charpy-V specimens or Charpy-V-type specimens with reduced width. The minimum impact value will be reduced proportionally to the reduction of the specimen’s cross section
- 0 °C Charpy impact energy, V-notch of 34 J - *
Creep strength 10^4 cycles 400 °C Creep strength 10^4 cycles of 324 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 400 °C Creep strength 10^4 cycles of 402 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 410 °C Creep strength 10^4 cycles of 315 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 410 °C Creep strength 10^4 cycles of 385 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 420 °C Creep strength 10^4 cycles of 306 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 420 °C Creep strength 10^4 cycles of 368 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 430 °C Creep strength 10^4 cycles of 295 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 430 °C Creep strength 10^4 cycles of 348 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 440 °C Creep strength 10^4 cycles of 281 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 440 °C Creep strength 10^4 cycles of 328 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 450 °C Creep strength 10^4 cycles of 265 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 450 °C Creep strength 10^4 cycles of 304 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 460 °C Creep strength 10^4 cycles of 239 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 460 °C Creep strength 10^4 cycles of 274 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 470 °C Creep strength 10^4 cycles of 212 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 470 °C Creep strength 10^4 cycles of 242 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 480 °C Creep strength 10^4 cycles of 180 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 480 °C Creep strength 10^4 cycles of 212 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 490 °C Creep strength 10^4 cycles of 145 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 490 °C Creep strength 10^4 cycles of 179 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
- 500 °C Creep strength 10^4 cycles of 108 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^4 cycles
- 500 °C Creep strength 10^4 cycles of 147 MPa - rupture strength | average of the scatter band known to date., 10^4 cycles
Creep strength 10^5 cycles 400 °C Creep strength 10^5 cycles of 294 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 400 °C Creep strength 10^5 cycles of 373 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 410 °C Creep strength 10^5 cycles of 279 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 410 °C Creep strength 10^5 cycles of 349 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 420 °C Creep strength 10^5 cycles of 263 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 420 °C Creep strength 10^5 cycles of 325 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 430 °C Creep strength 10^5 cycles of 245 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 430 °C Creep strength 10^5 cycles of 300 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 440 °C Creep strength 10^5 cycles of 227 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 440 °C Creep strength 10^5 cycles of 273 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 450 °C Creep strength 10^5 cycles of 206 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 450 °C Creep strength 10^5 cycles of 245 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 460 °C Creep strength 10^5 cycles of 180 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 460 °C Creep strength 10^5 cycles of 210 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 470 °C Creep strength 10^5 cycles of 151 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 470 °C Creep strength 10^5 cycles of 175 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 480 °C Creep strength 10^5 cycles of 120 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 480 °C Creep strength 10^5 cycles of 139 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 490 °C Creep strength 10^5 cycles of 84 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 490 °C Creep strength 10^5 cycles of 104 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
- 500 °C Creep strength 10^5 cycles of 49 MPa - Strength for 1% (plastic) creep strain | average of the scatter band known to date., 10^5 cycles
- 500 °C Creep strength 10^5 cycles of 69 MPa - rupture strength | average of the scatter band known to date., 10^5 cycles
Elongation - Elongation of 16 % - min. for plate thickenss t ≤ 250 mm | transverse specimens (ambient temp.), A5
Tensile strength - Tensile strength of 580 - 740 MPa - for plate thickness 150 < t ≤ 250 mm | transverse specimens (ambient temp.)
- - Tensile strength of 590 - 740 MPa - for plate thickness 100 < t ≤ 150 mm | transverse specimens (ambient temp.)
- - Tensile strength of 600 - 760 MPa - for plate thickness 60 < t ≤ 100 mm | transverse specimens (ambient temp.)
- - Tensile strength of 610 - 780 MPa - for plate thickness t ≤ 60 mm | transverse specimens (ambient temp.)
Yield strength - Yield strength of 400 MPa - min. ReH for plate thickness 200 < t ≤ 250 mm | transverse specimens (ambient temp.)
- - Yield strength of 410 MPa - min. ReH for plate thickness 150 < t ≤ 200 mm | transverse specimens (ambient temp.)
- - Yield strength of 420 MPa - min. ReH for plate thickness 100 < t ≤ 150 mm | transverse specimens (ambient temp.)
- - Yield strength of 430 MPa - min. ReH for plate thickness 60 < t ≤ 100 mm | transverse specimens (ambient temp.)
- - Yield strength of 440 MPa - min. ReH for plate thickness 40 < t ≤ 60 mm | transverse specimens (ambient temp.)
- - Yield strength of 460 MPa - min. ReH for plate thickness t ≤ 40 mm | transverse specimens (ambient temp.)
- 100 °C Yield strength of 373 MPa EN 10028-2 min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens
- 100 °C Yield strength of 382 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 100 °C Yield strength of 392 MPa EN 10028-2 min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens
- 100 °C Yield strength of 401 MPa EN 10028-2 min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens
- 100 °C Yield strength of 410 MPa EN 10028-2 min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens
- 100 °C Yield strength of 429 MPa EN 10028-2 min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens
- 150 °C Yield strength of 361 MPa EN 10028-2 min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens
- 150 °C Yield strength of 370 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 150 °C Yield strength of 379 MPa EN 10028-2 min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens
- 150 °C Yield strength of 388 MPa EN 10028-2 min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens
- 150 °C Yield strength of 397 MPa EN 10028-2 min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens
- 150 °C Yield strength of 415 MPa EN 10028-2 min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens
- 200 °C Yield strength of 350 MPa EN 10028-2 min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens
- 200 °C Yield strength of 359 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 200 °C Yield strength of 368 MPa EN 10028-2 min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens
- 200 °C Yield strength of 377 MPa EN 10028-2 min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens
- 200 °C Yield strength of 385 MPa EN 10028-2 min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens
- 200 °C Yield strength of 403 MPa EN 10028-2 min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens
- 250 °C Yield strength of 340 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 250 °C Yield strength of 349 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 250 °C Yield strength of 357 MPa EN 10028-2 min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens
- 250 °C Yield strength of 366 MPa EN 10028-2 min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens
- 250 °C Yield strength of 374 MPa EN 10028-2 min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens
- 250 °C Yield strength of 391 MPa EN 10028-2 min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens
- 300 °C Yield strength of 330 MPa EN 10028-2 min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens
- 300 °C Yield strength of 338 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 300 °C Yield strength of 347 MPa EN 10028-2 min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens
- 300 °C Yield strength of 355 MPa EN 10028-2 min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens
- 300 °C Yield strength of 363 MPa EN 10028-2 min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens
- 300 °C Yield strength of 380 MPa EN 10028-2 min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens
- 350 °C Yield strength of 318 MPa EN 10028-2 min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens
- 350 °C Yield strength of 327 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 350 °C Yield strength of 335 MPa EN 10028-2 min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens
- 350 °C Yield strength of 342 MPa EN 10028-2 min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens
- 350 °C Yield strength of 350 MPa EN 10028-2 min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens
- 350 °C Yield strength of 366 MPa EN 10028-2 min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens
- 400 °C Yield strength of 305 MPa EN 10028-2 min. Rp0.2 for plate thickness 200 < t ≤ 250 mm | transverse specimens
- 400 °C Yield strength of 313 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 400 °C Yield strength of 320 MPa EN 10028-2 min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens
- 400 °C Yield strength of 328 MPa EN 10028-2 min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens
- 400 °C Yield strength of 335 MPa EN 10028-2 min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens
- 400 °C Yield strength of 351 MPa EN 10028-2 min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens
- 450 °C Yield strength of 288 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 250 mm | transverse specimens
- 450 °C Yield strength of 295 MPa EN 10028-2 min. Rp0.2 for plate thickness 150 < t ≤ 200 mm | transverse specimens
- 450 °C Yield strength of 302 MPa EN 10028-2 min. Rp0.2 for plate thickness 100 < t ≤ 150 mm | transverse specimens
- 450 °C Yield strength of 309 MPa EN 10028-2 min. Rp0.2 for plate thickness 60 < t ≤ 100 mm | transverse specimens
- 450 °C Yield strength of 317 MPa EN 10028-2 min. Rp0.2 for plate thickness 40 < t ≤ 60 mm | transverse specimens
- 450 °C Yield strength of 331 MPa EN 10028-2 min. Rp0.2 for plate thickness t ≤ 40 mm | transverse specimens

DIWA 373 (EN 1.6368) thermal

Property - -
Application areas
Cold Forming
Delivery condtion
Flame cutting and welding
General note
Heat Treatment Austenitizing/Cooling/Tempering¹
Austenitizing: 880-940 °C
- Cooling: After temperature equalization (880-940 °C) over the whole section
cooling in air or water according to plate thickness.
- Tempering: 640-680 °C After equalization over the whole section holding time at least 30 min.		 ≤ 15
> 15 ≤ 60
> 60		 ≥ 30
≥ 2 x t
120

DIWA 373 (EN 1.6368) chemical

Property Value Comment
Aluminium Aluminium of 0.01 % min. tot. product
- Aluminium of 0.015 % min. tot. heat
Carbon Carbon of 0.17 % max. heat
- Carbon of 0.19 % max. product
Chromium Chromium of 0.3 % max. heat
- Chromium of 0.35 % max. product
Copper Copper of 0.4 - 0.9 % product
- Copper of 0.5 - 0.8 % heat
Iron -
Manganese Manganese of 0.75 - 1.3 % product
- Manganese of 0.8 - 1.2 % heat
Molybdenum Molybdenum of 0.22 - 0.54 % product
- Molybdenum of 0.25 - 0.5 % heat
Nickel Nickel of 0.9 - 1.4 % product
- Nickel of 1 - 1.3 % heat
Niobium Niobium of 0.005 - 0.055 % product
- Niobium of 0.015 - 0.045 % heat
Nitrogen Nitrogen of 0.02 % max. heat
- Nitrogen of 0.022 % max. product
Phosphorus Phosphorus of 0.025 % max. heat
- Phosphorus of 0.03 % max. product
Silicon Silicon of 0.2 - 0.56 % product
- Silicon of 0.25 - 0.5 % heat
Sulfur Sulfur of 0.01 % max. heat
- Sulfur of 0.013 % max. product

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