30CD4FF
30CD4FF is a designation in AFNOR for the material held under material number 1.7220, also listed as 34CrMo4. It is a material in the category Quenched and tempered steels. We list 159 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, SAE AMS, JIS, GB, GOST, UNI, SS, ČSN, PN, SRPS, MSZ, STAS, AS / NZS, BDS, ÖNORM, NBN, SFS and KS.
If you came for one of these
The most-used names for this grade.About Quenched and tempered steels
Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
159 designations · 25 standards · nothing hiddenEvery designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
7 elements on file · weight %What this alloy is
Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.
| Element | % by weight |
|---|---|
0.3–0.37 | |
≤ 0.4 | |
0.6–0.9 | |
0.035 | |
0.035 | |
0.9–1.2 | |
0.15–0.3 |
The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other.
| Element | As publishedsource text, verbatim | Min% by weight | Max% by weight | Bound |
|---|---|---|---|---|
| C | 0,30-0,37 | 0.300 | 0.370 | Range |
| Si | ≤0,40 | — | 0.400 | Max |
| P | 0,035 | 0.035 | 0.035 | Exact |
| S | 0,035 | 0.035 | 0.035 | Exact |
| Cr | 0,90-1,20 | 0.900 | 1.200 | Range |
| Mn | 0,60-0,90 | 0.600 | 0.900 | Range |
| Mo | 0,15-0,30 | 0.150 | 0.300 | Range |
The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred.
Predicted transformation temperatures
Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni.
Physical & mechanical properties
An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material.
Properties by condition
12 conditions · 93 valuessteelnumber| Thicknessmm | A% · Lo = 5,65 √So |
|---|---|
| ≤ 16 | 11 |
| 16 – 40 | 12 |
| 40 – 100 | 14 |
| 100 – 160 | 15 |
| 160 – 250 | 15 |
steelnumber| Thicknessmm | RmN/mm² |
|---|---|
| ≤ 8 | 1000 |
| 8 – 20 | 900 |
| 20 – 50 | 800 |
| 50 – 80 | 750 |
splav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| max thickness 100 | 950 | 750 | 13 | 42 | 650 |
| max thickness 120 | 900 | 710 | 13 | 42 | 650 |
| max thickness 150 | 800 | 600 | 14 | 45 | 650 |
| max thickness 200 | 700 | 500 | 16 | 45 | 600 |
steeljis| Delivery state | RmN/mm² | ReN/mm² | A% | Z% | HB |
|---|---|---|---|---|---|
| Tempering after normalizing | 690 | 440 | 9 | 25 | 201 |
| Tempering after quenching | 740 | 540 | 9 | 25 | 217 |
steelnumber| Thicknessmm | RmN/mm² | A80% |
|---|---|---|
| 0.3 – 3 | 600 | 16 |
splav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| Ø 25 | 930 | 835 | 12 | 45 | 780 |
steelnumber| Delivery state | HB |
|---|---|
| Treated to improve shearability | 255 |
steelnumber| Delivery state | HB | HV |
|---|---|---|
| Soft annealed | 223 | 185 |
splav| Delivery state | HB |
|---|---|
| (annealing) , GOST 4543-71 | 241 |
steelnumber| Delivery state | HV |
|---|---|
| Quenched and tempered | 315 – 465 |
splav| Temperature°C | Densityg/cm³ | Elastic modulusGPa | Thermal expansion coefficient10^-6/K | Thermal conductivityW/(m·K) | Specific heat capacityJ/(kg·K) | Electrical resistivitynΩ·m |
|---|---|---|---|---|---|---|
| 20 | 7.82 | 218 | — | — | — | 328 |
| 100 | 7.8 | 216 | 12.3 | 40.6 | 462 | 360 |
| 200 | 7.77 | — | 12.6 | 39.8 | — | — |
| 300 | 7.74 | 205 | 12.9 | 38.5 | — | 425 |
| 400 | 7.7 | 195 | 13.9 | 37.3 | — | 523 |
| 500 | 7.66 | 186 | 14.4 | — | — | 628 |
| 600 | — | — | 14.6 | — | — | — |
caishuku| Temperature°C | Elastic modulusGPa | Thermal expansion coefficient10^-6/K | Thermal conductivityW/(m·K) | Specific heat capacityJ/(kg·K) | Electrical resistivitynΩ·m | GGPa |
|---|---|---|---|---|---|---|
| 20 | 210 | — | — | 461 | 180 | 81 |
| 100 | 205 | 12.3 | 40.61 | — | — | 79 |
| 200 | — | 12.6 | — | — | — | — |
| 300 | 185 | — | 38.52 | — | — | 71 |
| 400 | — | 13.9 | 37.26 | — | — | — |
| 600 | — | 14.6 | — | — | — | — |
6 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition.
Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ.
Heat treatment
GB /T 18248-2021
- QuenchingTemperature not stated
- NormalizingTemperature not stated
- Tempering500–600 °CCooling Oil
GB /T 3077-2015
- Quenching880 °C
- Tempering650 °C
GB /T 6478-2015
- Quenching830–870 °CCooling Oil
- Tempering500–600 °C
GB T 6478-2001
- Quenching830–870 °CQuenchant Water or Oil
- Tempering500–600 °C
NB /T 47008-2017
- Tempering580 °C
Supply condition
- Annealing
- Quenching and Temperingd=25
- Quenching and Temperingd=25
- Annealing and Tempering and NormalizingSupply condition
- Spheroidize annealingPlate and Strip
- Quenching and tempering≤100
Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied.
Source: www.caishuku.com
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.7, a shared category, and a published range for Cr / Mn that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade.
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 28 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 56 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 104 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 67 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 13 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 10 designations
Looking for this grade under another name?
Search the catalogue by designation, material number or composition — every name on this page is itself a way in.