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DIN 17240

DIN 17240 Specification

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

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 numberMaterial numberCondition 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)1.0501N≤ 100280500 to 65021–––350
V≤ 160280500 to 6502240––400
Ck351.1181V≤ 60280500 to 65022455555350 4)
–> 60 ≤ 160280500 to 65022454139360 4)
Cq351.1172V5)≤ 40280500 to 65022455555350 4)
24CrMo51.7258V≤ 100440600 to 7501860103118400
> 100 ≤ 160420600 to 750186089102400
21CrMoV5 7)1.7709V≤ 250550700 to 850 6)16606963540
40CrMoV471.7711V≤ 100700850 to 1000 6)1445417)477)540
X22CrMoV1211.4923V≤ 250600800 to 95014403427580
700900 to 105011352720580
X19CrMoVNbN1111.4913V≤ 250780900 to 1050 6)10402420580
X8CrNiMoBNb16161.4986(WK + AL)≤ 100500650 to 850 6)16404847650
NiCr20TiAl2.4952(AR)≤ 160600> 100012121720700
  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 numberMaterial numberCondition 1)Applicable
for
diameters mm		20 °C200 °C250 °C300 DC360 DC400 °C450 °C500 °C550 °C600 °C650 °C
    N/mm2
Ck351.1181V160280220203186167147     
Cq351.1172V40280220203186167147     
24CrMo51.7258V≤ 100440412392363333304275235   
> 100 ≤ 160420382372344324294265226   
21CrMoV571.7709V250550500480460441412372334275  
40CrMoV471.7711V100700635617598578540500460403  
X22CrMoV1211.4923V≤ 250600530505480452423382344284206 
700603578550515485442392329250 
X19CrMoVNbN1111.4913V250780700680655620580530470400315 
X8CrNiMoBNb16161.4986(WK ÷ AL)≤ 100500432412393372353334314284255206
NiCr20’11A12.4952(AH)≤ 160600568564560550540530520510500480
 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 °C100 °C200 °C300 DC400 °C450 °C500 °C550 °C600 °C700 °C800 °C
 N/mm2
Ferritic steels
(1.0501, 1.1181, 1.1172, 1.7258, 1.7709, 1.7711)		211204196186177172164152127––
Steels with about 12% Cr
(1.4923, 1.4913)		216209200190179175167157127––
Austenitic steels
(1.4986)
196192186181174170165161157147–
NiCr20TiAl216212208202196193189184179161130
 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

Material  Chemical composition in % by wt.
Code numberMaterial numberCondition 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
C351.05017,8511,112,112,913,513,914,1  204220460
Ck351.1181
Cq351.1172
24CrMo51.7258203320460
21CrMoV571.7709
40CrMoV471.7711
X22CrMoV1211.49237,710,51111,51212,312,5  20
20 to 650		24
29		20
0 to 800		460
540
X19CrMoVNbN1111.7709
X8CrNiMoBNb16161.49867,916,617,717,917,917,918,118,318,620
650		15
25		20
0 to 800		460
590
NiCr20TiAl2.49528,211,912,613,113,513,714,014,515,120
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

Material1)Hot formingHardening,
quenching or
solution annealing

Cooling inTempering or
age hardening or
precipitation hardening 		Stress-relief
annealing
Code numberMaterial numberDC°C °CC
C351.05011100 to 850870 to 900Oil650 to 710, min. 2 h550 to 620
Ck351.1181
Cq351.1172
24CrMo5L72581100 to 850900 to 950Oil or air650 to 710, min. 2 h550 to 620
21CrMoV57 2)1.77091100 to 850890 to 940Oil or air680 to 720, min. 2 h580 to 650
40CrMoV47 2)1.77111100 to 850880 to 930Oil (or air)670 to 730, min. 2 h570 to 640
X22CrMoV1211.49231100 to 8501020 to 1070Air or oil640 to 720, min. 2 h600 to 680
X8CrNiMoBNb16161.49861150 to 850 3)  750 to 800, 5 to 1 hfair750 to 800
NiCr20TiAl 4)2.49521150 to 10501050 to 1080, 8 hAir840 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).