Fasteners, Stud Bolts, Screws, Nuts, Washers
EN 10269 25crmo4 Specification is a European Standard that specifies requirements for semi-finished products, bars and rods for fasteners with properties specified at elevated and/or low temperatures made of non-alloy and alloy (including stainless) steels and nickel alloys.
The requirements of this standard may be applied also to the finished fasteners.
The general technical delivery conditions in EN 10021 also apply to products supplied in accordance with this European Standard.
NOTE : Once this European Standard is published in the EU Official Journal (OJEU) under Directive 97/23/EC, presumption of conformity to the Essential Safety Requirements (ESRs) of Directive 97/23/EC is limited to technical data of materials in this European Standard and does not presume adequacy of the material to a specific item of equipment. Consequently, the assessment of the technical data stated in this material standard against the design requirements of this specific item of equipment to verify that the ESRs of Directive 97/23/EC are satisfied, needs to be done.
| Material designation | Chemical composition, % by mass | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Name | Number | C | Si | Mn | P max. |
S max. |
Al tot | B | Cr | Mo | Ni | V | Others |
| 25CrMo4 | 1.7218 | 0,22 to 0,29 | ≤ 0,40 | 0,60 to 0,90 | 0.025 | 0.035 | - | - | 0,90 to 1,20 | 0,15 to 0,30 | - | - | - |
| Element(s) | Specified limits, cast analysis % by mass |
Permissible tolerance a % by mass |
|---|---|---|
| C | < 0,03 | ± 0,005 |
| ≥ 0,03 ≤ 0,20 | ± 0,01 | |
| > 0,20 ≤ 0,50 | ± 0,02 | |
| Si | ≤ 0,40 | ± 0,03 |
| > 0,40 ≤ 1,00 | ± 0,05 | |
| Mn | ≤ 2,00 | ± 0,04 |
| > 2,00 ≤ 7,0 | ± 0,10 | |
| P | ≤ 0,045 | +0.005 |
| S | ≤ 0,015 | +0.003 |
| > 0,015 ≤ 0,035 | +0.005 | |
| N | ≤ 0,040 | ± 0,005 |
| > 0,040 ≤ 0,18 | ± 0,01 | |
| Al | ≥ 0,015 ≤ 0,08 | +0,01 -0,005 |
| > 0,08 ≤ 0,35 | ± 0,05 | |
| > 0,35 ≤ 1,80 | ± 0,10 | |
| B | ≤ 0,010 | ± 0,000 5 |
| > 0,010 ≤ 0,10 | ± 0,005 | |
| Cr | ≤ 2,00 | ± 0,05 |
| > 2,00 < 10,0 | ± 0,10 | |
| ≥ 10,0 < 15,0 | ± 0,15 | |
| ≥ 15,0 ≤ 21,0 | ± 0,20 | |
| Cu | ≤ 0,50 | +0.05 |
| > 0,50 ≤ 4,0 | ± 0,10 | |
| Mo | ≤ 0,60 | ± 0,03 |
| > 0,60 < 1,75 | ± 0,05 | |
| ≥ 1,75 ≤ 3,00 | ± 0,10 | |
| Ni | ≤ 1,00 | ± 0,03 |
| > 1,00 ≤ 5,0 | ± 0,07 | |
| > 5,0 ≤ 10,0 | ± 0,10 | |
| > 10,0 ≤ 20,0 | ± 0,15 | |
| > 20,0 ≤ 27,0 | ± 0,20 | |
| Cr+Mo+Ni | ≤ 0,63 | +0.05 |
| Nb | ≤ 1,25 | ± 0,05 |
| Nb+Ta | ≥ 0,70 ≤ 1,20 | ± 0,10 |
| Ti | ≤ 0,15 | ± 0,01 |
| > 0,15 ≤ 1,00 | ± 0,05 | |
| > 1,00 ≤ 2,75 | ± 0,10 | |
| V | ≤ 0,05 | ± 0,01 |
| > 0,05 ≤ 0,80 | ± 0,03 | |
| As | ≤ 0,020 | ± 0,003 |
| Sn | ≤ 0,020 | ± 0,003 |
| Feb | ≤ 1,50 | +0.05 |
| > 1,50 ≤ 9,0 | ± 0,10 | |
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| Material designation | Heat treatment condition a,b | Hardness HBW max. |
Tensile strength Rm MPa max. |
Reduction in area Z % min. |
|
|---|---|---|---|---|---|
| Name | Number | ||||
| 25CrMo4 | 1.7218 | +S | 255 | - | - |
| +A | 212 | - | - | ||
| +AC | - | 580 | 59 | ||
| Material designation | Heat treatment condition a |
Diameter c | Proof strength | Tensile strength | Elongation after fracture | Reduction in area | Impact energy (ISO-V) at 20°C | |
|---|---|---|---|---|---|---|---|---|
| Name | Number | |||||||
| d mm |
Rp0,2 MPa min. |
Rm MPa |
A % min. |
Z % min. |
KV2 J min. |
|||
| 25CrMo4 | 1.7218 | +QT | d ≤ 100 | 440 | 600 to 750 | 18 | 60 | 60 |
| 100< di 150 | 420 | 600 to 750 | 18 | 60 | 45 | |||
| Material designation | Heat treatment condition a | Diameter e d mm |
Minimum 0,2 %-proof strength Rp0,2 in MPa at a temperature (in °C) of: | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Name | Number | 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 | 600 | 650 | ||
| 25CrMo4 | 1.7218 | +QT | d ≤ 100 | 435*) | 428*) | 420*) | 412 | 392 | 363 | 333 | 304 | 275 | 235 | - | - | - |
| 100 < d ≤ 150 | 414*) | 403*) | 393*) | 382 | 372 | 344 | 324 | 294 | 265 | 226 | - | - | - | |||
| Material designation | Heat treatment condition a | Diameter e d mm |
Minimum impact energy KV2 in J c (ISO-V test piece) at a test temperature in °C of: |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Name | Number | -270 | -196 | -160 | -140 | -120 | -110 | -100 | -90 | -80 | -70 | -60 | -50 | -40 | -20 | 0 | +20 | ||
| 25CrMo4 | 1.7218 | +QT | d ≤ 60 | - | - | - | - | - | - | - | - | - | - | 40 | 40 | 45 | 50 | - | 60 |
| 60 < d ≤ 100 | - | - | - | - | - | - | - | - | - | - | - | 40 | 40 | 50 | - | 60 | |||
| Test | Test statusa | Number of samples for batches of | Number of test pieces per sample | |||
|---|---|---|---|---|---|---|
| ≤ 10 t | > 10 t to ≤ 15 t | > 15 t | ||||
| Chemical analysis | cast | m | 1/cast (see 8.3.1 and 11.1) | |||
| product | Ob | (see 10.1.1) | ||||
| Hardness test on homogeneity / shearing | Oc | (see 10.1.2 and 10.2.1.3) | ||||
| Intergranular corrosion resistance | Oc | (see 11.6.5) | ||||
| Tensile test at room temperature | m | 2 | 3 | 4 | 1 | |
| Tensile test at elevated temperature | Od | 1 | ||||
| Impact test at room temperature | Me | 3 | ||||
| Impact test at low temperature | Of | 3 | ||||
| Non-destructive testing | Og | not applicable | ||||
| Verification of surface quality | o | |||||
| Other tests | Mh | |||||
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