material properties from fkm

3.2 Material properties 76 3 Assessment of the static strengthusing nominal stresses

1R32 EN.dog

-deff

Valuesaccordingto standards

Componentvalues -

(Jg)de ff .N

Rm,N

77

78

81

80

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Component values according to standardsGeneralComponent values according to standardsof semi-finished products or test piecesComponent values according tothe drawingSpecial case of actual component values

Technological size factorGeneralDependence on the effective diameterEffective diameter

Contents

3.2.0 General

3.2.13.2.1.03.2.1.1

3.2.1.3

3.2.23.2.2.03.2.2.13.2.2.2

3.2.1.2

3.2.3 Anisotropy factor

3.2.4 Compression strength factor andshear strength factor

3.2.4.0 General3.2.4.1 Compression strength factor3.2.4.2 Shear strength factor

3.2 Material properties

3.2.53.2.5.03.2.5.13.2.5.23.2.5.3

Temperature factorsGeneral~ormal temperatureLow temperatureElevated temperature

Figure 3.2.1 Values according to standards and com-ponent values according to standards, Rm and Rp, orvalues specified by drawings, Rm,z and Rp,Z .Top: All kinds of material except GG, Rm ::: Rm.N, R" ::: R",NSemi-logarithmic decrease of the mechanical material properties with theeffective diameter d.n- .

3.2.0 GeneralAccording to this chapter the mechanical materialproperties like tensile strength R.n, yield strength R, andfurther characteristics for non-welded and welded'components are to be determined.

All mechanical material properties are those of thematerial test specimen. Values according to standards,component values and component values according tostandards are to be distinguished, Figure 3.2.1.

Bottom: GG, Rm ::: or ~ Rm.N . Double-logarithmic decrease of themechanical material properties with the effective diameter dell'.

Specified values according to drawings Rm.z and R",z.

Values according to standards

The values according to standards (R.n,N , Rm , Rp,N , Rp)correspond to an average probability of survivalPo = 97,5 % and depend on the effective diameter deffand on the technological size factor.

Material test specimen

In the context of this guideline the material testspecimen is an unnotched polished round specimen ofdo= 7,5 mm diameter *1.

Component values

The component values CRm , R.n.z , R, , Rp,z ) are validfor the effective diameter deff of the component, theymay correspond to different probabilities of survival Po,however.

1 This definition is the basis of the present calculation, althoughspecimens for tensile tests may usually have diameters different from7,5 mm.

Special case of actual component values

If specific values for a component (R.n,r , Rp,r) have beendetermined experimentally, they normally apply to aprobability of survival Po = 50 % , and therefore theyare valid only for the particular component, but not forthe entirety of all those components. They may be used,for instance, for a subsequent assessment of the strength


3.2.1.2 Component values according to the drawingThe component value of the tensile strength, Rm, is

Moreover there are to be considered: for compressivestresses the compression strength factor fa , Chapter3.2.4, for shear stresses the shear strength factor f, ,Chapter 3.2.4, and for elevated temperature thetemperature factors Kt,m , ..., Chapter 3.2.5.

product *3 , in the case of cast iron or cast aluminum itis the value from the test piece according to the materialstandard.

The yield strength, Rp,N , is the guaranteed minimumvalue specified for the smallest size of the semi-finishedproduct *3 or for the test piece defined by the materialstandard *4.

of the particular component in case of a service failure,if for that purpose all safety factors are set to 1,00 inaddition.

Component values according to standards

The component values according to standards


For milled steel there is deff,max,m = deff,max,p = 250 mm.For all other kinds of material there are no upper limitvalues deff,max, ... ,

3.2.1.3 Special case of actual component values

If only an experimental value of the tensile strength Rm,Iis known the value of the yield strength Rp,I may becomputed from Eq. (3.2.3) with Rm = Rm,I. deft:max.m = deft:max.p = 00 , (3.2.11)

unless otherwise specified in the material standards.

For stainless steel within the dimensions given inmaterial standards there is

For GG the following technological size factor appliesto the tensile strength: For deff :s; 7,5 mm

3.2.2 Technological size factor3.2.2.0 General

Kd,m = Kct,p =1. (3.2.7)For all other kinds of steel and cast iron materials thetechnological size factor is: For deff s deff,N,m

(3.2.13)

(3.2.12)

(3.2.14)

(3.2.15)KcI,m = Kct,p = 1.

:KI.m = :KI.p = 1,

:KI.m = :KI.p = 0,6 .

for 12 mm < deft'< deft:max.m = deft:max.p = 150 mmv. = v. = 1 1 . (d /7 5 mm) -0,2.J..~m .J..~p , Ueff , ,

for deft'~ deft:max.m = deft:max.p = 150 mm

Aluminum alloys

For wrought aluminum alloys the component values ofthe tensile strength, Rm , and of the yield strength, Rp,are given in Chapter 5 according to the type of materialand its condition, and depending on the thickness ordiameter of the semi-finished product. To these valuesthe technological size factors Kj., = :KI.p = 1 apply.For cast aluminum alloys the technological size factorsfor the tensile strength and for the yield strength are asfollows: For deft':::; deft:N,m = deft:N,p = 12 mm

For materials such as conditionally weldable steel,stainless steel or weldable cast iron the subsequentcalculation is provisional and therefore it is to beapplied with caution.

Welded components *10

For all kinds of material the technological size factor forthe toe section and for the throat section of weldedcomponents is *11

(3.2.4)

(3.2.5)

(3.2.8) .(3.2.9)

Kd,m = 1,207,

for deff > 7,5 mm *8

Kd,m = 1,207' (deff/7,5 mm)-0,1922.

KcI,m = Kd,p =1,

for deff,N,m < deff :s; deff,max,m *9:

3.2.2.1 Dependence on the effective diameterNon-welded components

Steel and cast iron materials

The technological size factor accounts for a decrease ofthe material strength values usually observed withincreasing dimensions of the component. It is specifiedas a function of the effective diameter, Figure 3.2.1. Itis different for non-welded and for welded components*7

1-0, 7686ad,m lg(deff /7,5mm)KcI,m ,1-0, 7686ad,m .lg(deff,N,m /7,5mm)

for deff ~ deff,max,m it is:~m = ~m (deff,max,m). (3.2.10)

deff effective diameter, Chapter 3.2.2.2 ,deff,N,m, ad,m constants, Table 3.2.1 and 3.2.2.

Considering the yield strength the values Kct,m , deff,N,m ,and act,m have to be replaced by the values ~p , deff,N,p ,and ad,p (except for GG).

3.2.2.2 Effective diameter

For components with a simple shape of the cross section- as far as a cross section may be defined - the effectivediameter is given according to the cross section in Table3.2.3.

In general the upper limit of the effective diameter isspecified in the material standards.

For the determination of the effective diameter deff twocases are to be distinguished as to the kind of material.

Table 3.2.1 Constants deff,N,m, ... , and adm, ... , forsteel

7 The influence factors according toChapter 3.2.3 (KA), Chapter 3.2.4(fer, f't) and Chapter 3.2.5 (KT m- ...) are supposed tobe valid for bothnon-welded and welded compon~nts.8 Footnote anEq. (3.2.6) cancelled.9 0,7686 = 1 fig 20.

10 Valid for steel, cast iron material and aluminum alloys.11 For structural steel and fine grain structural steel according toDIN 18800, part 1, page 40.

marcoyouriTexte surlign

marcoyouriTexte surlign

5.1 Material tables134

5 Appendices

Table 5.1.4 Mechanical properties in MFa for quenched and tempered steels in the quenched and temperedcondition, after DIN EN 10 083-1 (1996-10-00) --1. Notes? 1to --4 see next page.

Type of Type of MaterialRm,N R,N llci,p

material, material, No. crW,zd,N crSch,zd,N crW,b,N LW,s,N LW,t,N ad,rn

after DIN EN after ?2 --3 --3 ?3 ?3 ?3 ?4 ?410 027-1 DIN 17200

C22E Ck 22 1.1151C22R Cm22 1.1149 500 340 225 210 250 130 145 0,19 0,43C22 C 22 1.0402C25E Ck 25 1.1158 550C25R Cm25 1.1163 370 250 225 275 145 160 0,29 0,40C25 C25 1.0406C30E Ck 30 1.1178C30R Cm30 1.1179 600 400 270 245 295 155 175 0,26 0,37C30 C 30 1.0528C35E Ck 35 1.1181C35R Cm35 1.1180 630 430 285 255 310 165 185 0,20 0,39C35 C 35 1.0501C40E Ck40 1.1186C40R Cm40 1.1189 650 460 295 260 320 170 190 0,12 0,36C40 C40 1.0511C45E Ck45 1.1191C45R Cm45 1.1201 700 490 315 275 345 180 205 0,16 0,36C45 C45 1.0503C50E Ck 50 1.1206C50R Cm50 1.1241 750 520 340 290 365 195 215 0,21 0,35C50 C 50 1.0540C55E Ck 55 1.1203C55R Cm55 1.1209 800 550 360 305 390 210 230 0,19 0,35C55 C 55 1.0535C60E Ck60 1.1221C60R Cm60 1.1223 850 580 385 320 415 220 245 0,18 0,34C60 C60 1.060128Mn6 28Mn6 1.1170 800 590 360 305 390 210 230 0,30 0,3838Cr2 38 Cr 2 1.7003 800 550 360 305 390 210 230 0,37 0,5238CrS2 38 CrS 2 1.702346Cr2 46 Cr 2 1.7006 900 650 405 335 435 235 260 0,41 0,5446CrS2 46 CrS 2 1.702534Cr4 34 Cr4 1.7033 900 700 405 335 435 235 260 0,33 0,4934CrS4 34 CrS 4 1.703737Cr4 37 Cr4 1.7034 950 750 430 345 460 245 270 0,32 0,4637CrS4 37 CrS 4 1.703841Cr4 41 Cr 4 1.7035 1000 800 450 360 480 260 285 0,30 0,4441CrS4 41 CrS 4 1.703925CrMo4 25 CrMo4 1.7218 900 700 405 335 435 235 260 0,33 0,4925CrMoS4 25 CrMoS 4 1.721334CrMo4 34 CrMo 4 1.7220 1000 800 450 360 480 260 285 0,30 0,4434CrMoS4 34 CrMoS 4 1.722642CrMo4 42 CrMo 4 1.7225 1100 900 495 385 525 285 315 0,32 0,4342CrMoS4 42 CrMoS 4 1.722750CrMo4 50 CrMo4 1.7228 1100 900 495 385 525 285 315 0,28 0,3836CrNiMo4 36 CrNiMo 4 1.6511 1100 900 495 385 525 285 315 0,32 0,3834CrNiM06 34 CrNoMo6 1.6582 1200 1000 540 410 570 310 340 0,33 0,3930CrNiMo8 -- 1 30 CrNiMo 8 1.6580 1250 1050 565 420 595 325 355 0,36 0,4236NiCrMo16?1 1.6773 1250 1050 565 420 595 325 355 0,28 0,3251CrV4 50 CrY 4 1.8159 1100 900 495 385 525 285 315 0,28 0,33

5.1 Material tables135

5 Appendices

Table 5.1.5 Mechanical properties in MPa for quenched and tempered steels in the normalized condition,after DIN EN 10 083-1 (1996-10-00) -9-1.

Type of Type of Material Rn,N Re,N crW,zd,N CJSch,zd,N CJW,b,N 't W,s,N 'tW,I,N ~m ad,pmaterial, material, No.

-9-2 -9-3 -9-3after DIN EN after

10 027-1 DIN 17200

C22E Ck22 1.1151C22R Cm22 1.1149 430 240 195 185 215 110 125 0,08 0,19C22 C 22 1.0402C25E Ck 25 1.1158C25R Cm25 1.1163 470 260 210 200 235 120 140 0,10 0,18C25 C 25 1.0406C30E Ck 30 1.1178C30R Cm30 1.1179 510 280 230 215 255 135 150 0,10 0,19C30 C 30 1.0528C35E Ck 35 1.1181C35R Cm35 1.1180 550 300 250 225 275 145 160 0,10 0,19C35 C 35 1.0501C40E Ck40 1.1186C40R Cm40 1.1189 580 320 260 235 285 150 170 0,09 0,19C40 C40 1.0511C45E Ck45 1.1191C45R Cm45 1.1201 620 340 280 250 305 160 180 0,10 0,20C45 C45 1.0503CSOE Ck50 1.1206C50R Cm50 1.1241 650 355 295 260 320 170 190 0,10 0,19C50 C 50 1.0540C55E Ck 55 1.1203C55R Cm55 1.1209 680 370 305 270 335 175 195 0,09 0,20C55 C 55 1.0535C60E Ck60 1.1221C60R Cm60 1.1223 710 380 320 280 350 185 205 0,09 0,19C60 C60 1.060128Mn6 28Mn6 1.1170 630 345 285 250 310 165 185 0,07 0,17

-9- 1 Effective diameter deff,N = 16 rom.-9- 2 Re,N / Rm,N < 0,75 for all types ofmaterial listed.-9- 3 More specific values for the individual types ofmaterial compared to the average values given in Table 1.2.1 and 3.2.1.

Notes referring to Table 5.1.4:

-9- 1 Effective diameter deff,N;= 40 rom for 30 CrNiMo 8 and 36 NiCrMo 16, deff,N = 16 rom for all other types of material listed.-9- 2 Re,N / Rm,N < 0,75 up to and including 46 Cr 2, 46 CrS 2; Re,N / Rm,N > 0,75 from 34 Cr 4, 34 CrS 4 on.-9- 3 The fatigue strength values of the sulphur bearing steels 38 CrS 2 to 42CrMoS 4 are lower than the values listed for 28 Cr 2 to 42 CrMo 4.-9- 4 M ore specific values for the individual types of material compared to the average values given in Table 1.2.1 and 3.2.1.

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