| Symbol | Definition |
| +A (TC) | Soft annealed |
| +AC | Spheroidized annealed |
| +AR | Raw for rolling, natural state |
| +AT | Solubilization annealed |
| +BC | Hot formed and sandblasted |
| +BG (FP) | Spheroid annealing (not laminar) |
| +BK | Bright down, no heat treatment after drawing |
| +BKW | Cold drawing involving limited deformation |
| +C | Cold-drawn |
| +Cnnn | Cold drawn to obtain nnn N/mm2 |
| +CH | Core hardenability |
| +CR | Cold rolled |
| +DC | Condition of supply selected by supplier |
| +FP (NT) | Treated for ferrite-pearlite structure and hardness |
| +G | Ground |
| +GBK | Annealed in protected atmosphere (ex. bright annealing) |
| +GKZ | Spheroid annealing |
| +HC | Hot rolled followed by cold hardening |
| +H | Normal hardenability at maximum range |
| +HH | Hardenability restricted towards top |
| +HL | Hardenability restricted towards top |
| +HR | Treated for a certain range of hardness |
| +HW | Normal state of hot forming |
| +I | Isothermal annealing |
| +LC | Skin pass (flattened) |
| +M | Thermo-mechanically rolled |
| +MA | Machined |
| +N (TD) | Normalized |
| +NBK | Normalized in a controlled atmosphere |
| +NT | Normalized and tempered |
| +P | Hardened by precipitation |
| +PE | Peeled |
| +PI | Hot formed and pickled |
| +PL | Polished (smoothed) |
| +Q | Quenched |
| +QA | Quenched in air |
| +QO | Quenched in oil |
| +QT (TF) | Quenched and tempered |
| +QW | Quenched in water |
| +RA | Recrystallization annealing |
| +S | Annealed for cold shearing |
| +SH | Peeled |
| +SR (BKS) | Stress relieved |
| +T | Tempered |
| +TH (BF) | Treated to obtain a range of hardness |
| +U | Untreated |
| +WW | Hot forming |
| +V | Hardening and tempering |
| +Z15 | Through thickness property, minimum reduction of area 15% |
| +Z25 | Through thickness property, minimum reduction of area 25% |
| +Z35 | Through thickness property, minimum reduction of area 35% |
| < | Smaller or equal |
| > | Greater or equal |
| 2.1 | Statemente of compliance with yhe order. Document validate by the manufacturer |
| 2.2 | Statemente of compliance with yhe order, with indication of result of non-specific inspectio. Document validate by the manufacturer |
| 3.1 | Statemente of compliance with yhe order, with indication of result of specific inspectio. Document validate by the manufacturer’s authorized inspection representative indipendent of the manufacturing departement |
| 3.2 | Statemente of compliance with yhe order, with indication of result of specific inspectio. Document validate by the manufacturer’s authorized inspection representative indipendent of the manufacturing departement and either the purchaser’s authorized inspection representative or the inspector designated by the official regulations |
| HB | General Brinell hardness, ball |
| HB 30 | Brinell hardness, 3000 kgf ball 10 mm, duration 15 seconds |
| HBS | Brinell hardness ball steel |
| HBW | Brinell hardness, tungsten-carbide |
| HV | Vickers hardness |
| HV 10 | Vickers hardness load 10 Kgf (98,07 N) |
| HR | General Rockwell hardness |
| HRC | Rockwell hardness, diamond penetrator |
| HRB | Rockwell hardness, ball steel |
| A4 | Elongation L0 = 4 x Ø according ASME and ASTM |
| A5 | Elongation L0 = 5 x Ø according EURONORM |
| aK | Impact energy Joule / cm ² – daj / cm ² – kp / cm ² |
| Av | Impact energy Joule – Daj – kp |
| ….E | e.g. C45E with max sulphur content specified |
| ….R | e.g. C45R with a range of sulphur content specified |
| RSt…. | e.g. RSt 37-2 R = killed steel |
| RR…. | e.g. RRSt 44-3 special killed steel |
| U…. | e.g. USt 52.3 rimming steel |
| X…. | e.g. X6Cr17 X = the average content of at least one alloying element ? 5 % |
| m | e.g. Cm 55 with a range of sulphur content 0.020-0.040% |
| ….K | e.g. C15K, St 37-3 K = cold drawn |
| ….K | es. CK15 = fully killed |
| P | Steels for pressure purposes |
| S | Structural steel |
| H | Cable profile |
| QS | High quality steels |
| L | Use at cryogenic temperatures |
| N – KG | Use at ambient temperatures |
| NL – KT | Use at low temperatures |
| NH – KW | Use at high temperatures |
| FF | Fully killed steel |
| FN | Rimming steel not allowed |
| FU | Rimming steel allowed |
| GC | Suitable for cold drawing |
| G1 | Rimming steel allowed |
| G2 | Rimming steel not allowed |
| G3 | Fully killed steel |
| G4 | State of supply at producer’s discretion |
| J | Joule, energy unit impact |
| J2 | Guaranteed impact strength at –20 °C > 40J |
| J0 | Guaranteed impact strength at 0 °C > 27 J |
| JR | Guaranteed impact strength at +20 °C > 27 J |
| Kv | Impact strength with V notch 2 mm (equivalent KV, KVF, Charpy-V, ISO-V) |
| R | Room temperature |
| X | Suitable for low and high temperatures |
| Al | Aluminium |
| B | Boron |
| C | Carbon |
| Ca | Calcium |
| Co | Cobalt |
| Cr | Chromium |
| Cu | Copper |
| Fe | Iron |
| H, H2 | Hydrogen |
| Mn | Manganese |
| Mo | Molybdenum |
| N | Nitrogen |
| Nb | Niobium |
| Ni | Nickel |
| O | Oxygen |
| P | Phosphorous |
| Pb | Lead |
| S | Sulphur |
| Sb | Antimony |
| Se | Selenium |
| Si | Silicon |
| Sn | Tin |
| Ta | Tantalum |
| Te | Tellurium |
| Ti | Titanium |
| V | Vanadium |
| W | Tungsten |
| +A | Hot dip aluminium coating |
| +AR | Aluminium coating |
| +AS | Aluminium-silicon alloy coating |
| +AZ | Aluminium-zinc alloy coating (> 0% Al) |
| +CE | Electrolytic chromium/chromium oxide coating ECCS |
| +CU | Copper coating |
| +IC | Inorganic coating |
| +OC | Organic coating |
| +S | Hot dip tin coating |
| +SE | Electrolytic tin coating |
| +T | Hot dip lead-tin alloy (terne) coating |
| +TE | Electrolytic lead-tin alloy (terne) coating |
| +Z | Hot dip zinc (galvanized) coating |
| +ZA | Hot dip zinc-aluminium coating (> 50% Zn) |
| +ZE | Electrolytic zinc coating |
| +ZF | Hot dip zinc-iron (galvannealed) coating |
| +ZN | Electrolytic zinc-nickel coating |
| P | Tensile strength N/mm2 550 – 700 |
| Q | Tensile strength N/mm2 625 – 775 |
| R | Tensile strength N/mm2 700 – 850 |
| S | Tensile strength N/mm2 775 – 925 |
| T | Tensile strength N/mm2 850 – 1000 |
| U | Tensile strength N/mm2 925 – 1075 |
| V | Tensile strength N/mm2 1000 – 1150 |
| W | Tensile strength N/mm2 1075 – 1225 |
| X | Tensile strength N/mm2 1150 – 1300 |
| Y | Tensile strength N/mm2 1225 – 1375 |
| Z | Tensile strength N/mm2 > 1550 |
| J3 | Guaranteed impact strength at –30 °C > 27J |
| J4 | Guaranteed impact strength at –40 °C > 27J |
| J5 | Guaranteed impact strength at –50 °C > 27J |
| J6 | Guaranteed impact strength at –60 °C > 27J |
| KR | Guaranteed impact strength at +20 °C > 40 J |
| K0 | Guaranteed impact strength at 0 °C > 40 J |
| K2 | Guaranteed impact strength at -20 °C > 40 J |
| K3 | Guaranteed impact strength at -30 °C > 40 J |
| K4 | Guaranteed impact strength at -40 °C > 40 J |
| K5 | Guaranteed impact strength at -50 °C > 40 J |
| K6 | Guaranteed impact strength at -60 °C > 40 J |
| LR | Guaranteed impact strength at +20 °C > 60 J |
| L0 | Guaranteed impact strength at 0 °C > 60 J |
| L2 | Guaranteed impact strength at -20 °C > 60 J |
| L3 | Guaranteed impact strength at -30 °C > 60 J |
| L4 | Guaranteed impact strength at -40 °C > 60 J |
| L5 | Guaranteed impact strength at -50 °C > 60 J |
| L6 | Guaranteed impact strength at -60 °C > 60 J |