Symbols

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