DIN 17240 Specification for heat resisting and highly heat resisting materials for bolts and nuts.

DIN / 17240

Chemical Composition

Chemical composition of heat resisting and highly heat resisting materials for bolts and nuts (ladle analysis)

Material Chemical composition in % by wt.
Code number Material number C Si Mn I' S Al B Cr Mo Ni Ti V Others
maximum
Standard grades
C35 1.0501 0,32 to 0,39 0,15 to 0,35 0,50 to 0,80 0,045 0,045
Ck35 1.1181 0,32 to 0,39 0,15 to 0,35 0,50 to 0,80 0,035 0,035
Cq35 1.1172 0,32 to 0,39 0,15 to 0,40 4) 0,50 to 0,80 0,035 0,035
24CrMo5 1.7258 0,20 to 0,28 0,15 to 0,35 0,50 to 0,80 0,030 0,035 0,90 to 1,20 0,20 to 0,35
21CrMoV5 2) 1.7709 0,17 to 0,25 0,15 to 0,35 0,35 to 0,85 0,030 0,035 1,20 to 1,50 0,65 to 0,80 0,25 to 0,35
40CrMoV47 1.7711 0,36 to 0,44 0,15 to 0,35 0,35 to 0,85 0,030 0,035 0,90 to 1,20 0,60 to 0,75 0,25 to 0,35
X22CrMoV121 1.4923 0,18 to 0,24 0,10 to 0,50 0,30 to 0,80 0,035 0,035 11,0 to 12,5 0,80 to 1,20 0,30 to 0,80 0,25 to 0,35
X19CrMoVNIIN111 1.4913 0,16 to 0,22 0,10 to 0,50 0,30 to 0,80 0,035 0,035 0,010 10,0 to 11,5 0,50 to 1,00 0,30 to 0,80 0,10 to 0,30 Nb 0,15 to 0,50, N 0,05 to 0,10
X8CrNiMoBNh1616 1.4986 0,04 to 0,10 0,30 to 0,60 1,5 0,045 0,030 0,05 to 0,10 15,5 to 17,5 1,60 to 2,00 15,5 to 17,5 Nb Ta: 10 x% C to 1,20
NiCr20TiAl 3) 2.4952 0,10 '5.1,00 0,030 0,015 1,00 to 1,80 ≤ 0,008 18,0 to 21,0 ≤ 65 1,8 to 2,7 Co ≤ 'S2,00 Fe ≤ 53,00i
 1) Only usable for nuts.
  2) Instead of bolts and nuts of this steel, it is possible for a transitional period to use also bolts and nuts of steels 24 CrMoV 5 5 (material number 1.7733) and 21 CrMoV 5 11 (material number 1.8070) (see Explanations). In special cases, it is possible also to use steel 21 CrMoNiV 4 7 (material number 1.6981) instead of this material
  3) For this alloy, in all cases the values given in the latest issue of DIN 17 742 apply.
 4) Lower silicon contents may be agreed at the time of ordering, in which case any resulting changes in the guaranteed properties must be taken into account.

Guaranteed values for mechanical properties at room temperature of heat resisting and highly heat resisting materials for bolts and nuts (applies to longitudinal specimens)

Material Chemical composition in % by wt.
Code number Material number Condition 2) Applicable for diameters
mm 		Yield point or 0.2 % proof stress Tensile strength
N/mm2		 Elongallon
(L0 = 5 do)
%
min. 		Reduction in area
%
min. 		Absorbed DVM specimens
J
min. 		ISO V-notch specimens
J
min. 		Guidance value for normal upper limit of temperature of use in con- tinuous operation
C351) 1.0501 N ≤ 100 280 500 to 650 21 - - - 350
V ≤ 160 280 500 to 650 22 40 - - 400
Ck35 1.1181 V ≤ 60 280 500 to 650 22 45 55 55 350 4)
- > 60 ≤ 160 280 500 to 650 22 45 41 39 360 4)
Cq35 1.1172 V5) ≤ 40 280 500 to 650 22 45 55 55 350 4)
24CrMo5 1.7258 V ≤ 100 440 600 to 750 18 60 103 118 400
> 100 ≤ 160 420 600 to 750 18 60 89 102 400
21CrMoV5 7) 1.7709 V ≤ 250 550 700 to 850 6) 16 60 69 63 540
40CrMoV47 1.7711 V ≤ 100 700 850 to 1000 6) 14 45 417) 477) 540
X22CrMoV121 1.4923 V ≤ 250 600 800 to 950 14 40 34 27 580
700 900 to 1050 11 35 27 20 580
X19CrMoVNbN111 1.4913 V ≤ 250 780 900 to 1050 6) 10 40 24 20 580
X8CrNiMoBNb1616 1.4986 (WK + AL) ≤ 100 500 650 to 850 6) 16 40 48 47 650
NiCr20TiAl 2.4952 (AR) ≤ 160 600 > 1000 12 12 17 20 700
  1) Only usable for nuts.
  2) See also Tables 3 and 8.
  3) For acceptance testings, agreement can be made as to which of the two shapes of specimen quoted is to be used. If the values obtained for absorbed energy are below the minimum required values for ISO V-notch specimens, proceed as if the proof of absorbed energy were required on DVM specimens.
  4) In the case of nuts, the normal upper limit of temperature of use in continuous operation can be 50 00 higher.
 5) Because of its subsequent working by cold-forming, steel Cq35 is normally supplied in the "spheroidized" (GKZ) condition.
 6) The upper limit of the tensile strength range must not be exceeded; values slightly below the lower limit of the tensile strength range are permissible provided the minimum value for the yield point is reached.
 7) The values given are provisional values that will have to be checked.

Guaranteed values for mechanical properties at room temperature of heat resisting and highly heat resisting materials for bolts and nuts (applies to longitudinal specimens)

Material Yield point or 0.2 % stress limit at a temperature of 2), 3)
Code number Material number Condition 1) Applicable for diameters mm 20 °C 200 °C 250 °C 300 DC 360 DC 400 °C 450 °C 500 °C 550 °C 600 °C 650 °C
N/mm2
Ck35 1.1181 V 160 280 220 203 186 167 147
Cq35 1.1172 V 40 280 220 203 186 167 147
24CrMo5 1.7258 V ≤ 100 440 412 392 363 333 304 275 235
> 100 ≤ 160 420 382 372 344 324 294 265 226
21CrMoV57 1.7709 V 250 550 500 480 460 441 412 372 334 275
40CrMoV47 1.7711 V 100 700 635 617 598 578 540 500 460 403
X22CrMoV121 1.4923 V ≤ 250 600 530 505 480 452 423 382 344 284 206
700 603 578 550 515 485 442 392 329 250
X19CrMoVNbN111 1.4913 V 250 780 700 680 655 620 580 530 470 400 315
X8CrNiMoBNb1616 1.4986 (WK ÷ AL) ≤ 100 500 432 412 393 372 353 334 314 284 255 206
NiCr20'11A1 2.4952 (AH) ≤ 160 600 568 564 560 550 540 530 520 510 500 480
 1) See Tables 3 and 8.
 2) For unalloyed and low alloy ferritic-pearlitic steels, the yield point, or when there is no clearly defined yield point, the 0.2% limit is the criterion but for other materials only the 0.2% limit.
  3) The values for temperatures lying above the point of intersection with the corresponding creep limit curve, are guide values and are not subject to checking.

Guidance values for the static modulus of elasticity of heat resisting and highly heat resisting materials for bolts and nuts

Material group1) Static modulus of elasticity at a temperature of
20 °C 100 °C 200 °C 300 DC 400 °C 450 °C 500 °C 550 °C 600 °C 700 °C 800 °C
N/mm2
Ferritic steels (1.0501, 1.1181, 1.1172, 1.7258, 1.7709, 1.7711) 211 204 196 186 177 172 164 152 127 - -
Steels with about 12% Cr (1.4923, 1.4913) 216 209 200 190 179 175 167 157 127 - -
Austenitic steels (1.4986) 196 192 186 181 174 170 165 161 157 147 -
NiCr20TiAl 216 212 208 202 196 193 189 184 179 161 130
 1) Steels belonging to the material groups listed are quoted by their material number.

Guidance values for the physical properties of heat resisting and highly heat resisting materials for bolts and nuts

Material1) Density
at 20 °C
Coefficient of thermal expansion between 20 °C and
10 -6 K -1		 (Mean)
thermal conductivity 1)
(Mean) specific
heat capacity 1)
Code number Material number kg/dm3 100 °C 200 °C 300 DC 400 °C 500 °C 600 °C 700 °C 800 °C at °C W/K+m at °C J/Kg+K
C35 1.0501 7,85 11,1 12,1 12,9 13,5 13,9 14,1 20 42 20 460
Ck35 1.1181
Cq35 1.1172
24CrMo5 1.7258 20 33 20 460
21CrMoV57 1.7709
40CrMoV47 1.7711
X22CrMoV121 1.4923 7,7 10,5 11 11,5 12 12,3 12,5 20
20 to 650		 24
29		 20
0 to 800		 460
540
X19CrMoVNbN111 1.7709
X8CrNiMoBNb1616 1.4986 7,9 16,6 17,7 17,9 17,9 17,9 18,1 18,3 18,6 20
650		 15
25		 20
0 to 800		 460
590
NiCr20TiAl 2.4952 8,2 11,9 12,6 13,1 13,5 13,7 14,0 14,5 15,1 20
100
90		 13
12
28		 20
0 to 800		 460
590
 1) In most cases these are the results of measurements on individual melts. When further test results become available, it is intended to standardize values and where necessary correct them.

Information for hot forming and heat-treatment of heat resisting and highly heat resisting materials for bolts and nuts 1)

Material1) Hot forming Hardening, quenching or
solution annealing

Cooling in Tempering or
age hardening or
precipitation hardening
Stress-relief annealing
Code number Material number DC °C °C C
C35 1.0501 1100 to 850 870 to 900 Oil 650 to 710, min. 2 h 550 to 620
Ck35 1.1181
Cq35 1.1172
24CrMo5 L7258 1100 to 850 900 to 950 Oil or air 650 to 710, min. 2 h 550 to 620
21CrMoV57 2) 1.7709 1100 to 850 890 to 940 Oil or air 680 to 720, min. 2 h 580 to 650
40CrMoV47 2) 1.7711 1100 to 850 880 to 930 Oil (or air) 670 to 730, min. 2 h 570 to 640
X22CrMoV121 1.4923 1100 to 850 1020 to 1070 Air or oil 640 to 720, min. 2 h 600 to 680
X8CrNiMoBNb1616 1.4986 1150 to 850 3) 750 to 800, 5 to 1 hfair 750 to 800
NiCr20TiAl 4) 2.4952 1150 to 1050 1050 to 1080, 8 h Air 840 to 860, 24 h/air
and
690 to 710, 16 hiair
 1) The temperatures for hot forming are guide values, the other information should as far as possible be complied with.
 2)Because of its importance with regard to embrittlement, it is not permissible to go above the quenching temperature or below the tempering temperature quoted.
 3) Hot strain hardening at 750 to 850 °C.
 4) The complete, three-stage heat-treatment should be carried out after the last plastic forming operation (e.g. after thread roiling).