Hardness encoding

Quality

Description

F

As fabricated (no mechanical property limits specified).

0

Annealed - products achieving the required annealed properties after hot forming processes may be designated as O temper.

01

Thermally treated at approximately the same time and temperature required for solution treatment and slow cooled to room temperature (formerly designated as T41).

02

Thermomechanically processed to enhance formability, such as required for super-plastic forming (SPF).

03

Homogenized.

H12

Strain-hardened - 1/4 hard.

H14

Strain-hardened - 1/2 hard.

H16

Strain-hardened - 3/4 hard.

H18

Strain-hardened - 4/4 hard (fully hardened).

H19

Strain-hardened - extra hard.

Hxx4

Applies to embossed or patterned sheet or strip, fabricated from the corresponding Hxx temper.

Hxx5

Strain-hardened - applies to welded tubes.

H111

Annealed and slightly strain-hardened (less than H11) during subsequent operations such as stretching or levelling.

H112

Slightly strain-hardened from working at an elevated temperature from a limited amount of cold work (mechanical property limits specified).

H116

Applies to aluminium-magnesium alloys with a magnesium content of 4% or more and for which mechanical property limits and exfoliation corrosion resistance are specified.

H22

Strain-hardened and partially annealed - 1/4 hard.

H24

Strain-hardened and partially annealed - 1/2 hard.

H26

Strain-hardened and partially annealed - 3/4 hard.

H28

Strain-hardened and partially annealed - 4/4 hard (fully hardened).

H32

Strain-hardened and stabilized - 1/4 hard.

H34

Strain-hardened and stabilized - 1/2 hard.

H36

Strain-hardened and stabilized - 3/4 hard.

H38

Strain-hardened and stabilized - 4/4 hard (fully hardened).

H42

Strain-hardened and painted or lacquered - 1/4 hard.

H44

Strain-hardened and painted or lacquered - 1/2 hard.

H46

Strain-hardened and painted or lacquered - 3/4 hard.

H48

Strain-hardened and painted or lacquered - 4/4 hard (fully hardened).

W

Solution heat-treated (unstable temper). The period of natural ageing (W2h..) may also be specified.

W51

Solution heat-treated (unstable temper) and stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for hand or ring forging and rolled ring). The products receive no further straightening after stretching.

W510

Solution heat-treated (unstable temper) and stress-relieved by controlled stretching (permanent set 1% to 3% for extruted rod, bar, shapes and tube, 0.5% to 3% for drawn tube). The products receive no further straightening after stretching.

W511

Same as W510 except minor straightening is allowed after stretching to comply with standard tolerances.

W52

Solution heat-treated (unstable temper) and stress-relieved by compressing to produce a permanent set of 1- 5%.

W54

Solution heat-treated (unstable temper) and stress-relieved by restriking cold in the finish die (die forging).

T1

Cooled from an elevated temperature shaping process and naturally aged.

T2

Cooled from an elevated temperature shaping process, cold worked and naturally aged.

T3

Solution heat-treated, cold worked and naturally aged.

T31

Solution heat-treated, cold worked approximately 1% and naturally aged.

T351

Solution heat-treated, stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for rolled or cold-finished rod and bar, 1% to 5% for hand or ring forging and rolled ring) and naturally aged. The products receive no further straightening after

T3510

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for extruded rod, bar, shapes and tube, 0.5% to 3% for drawn tube) and naturally aged. The products receive no further straightening after stretching.

T3511

Same as T3510 except that minor straightening is allowed after stretching to comply with standard tolerances.

T354

Solution heat-treated stress-relieved by restriking cold in the finish die and naturally aged.

T36

Solution heat-treated, cold worked approximately 6% and naturally aged.

T37

Solution heat-treated, cold worked approximately 7% and naturally aged.

T39

Solution heat-treated and cold worked to an appropriate degree to achieve the specified mechanical properties. Cold work may be carried out before or after natural ageing.

T4

Solution heat-treated and naturally aged.

T42

Solution heat-treated and naturally aged. Applies to test material heat-treated from annealed or F temper or to products heat-treated from any temper by the user.

T451

Solution heat-treated, stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for rolled or cold-finished rod and bar, 1% to 5% for hand or ring forging and rolled ring) and naturally aged. The products receive no further straightening after stretching.

T4510

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for extruded rod, bar shapes and tube, 0.5% to 3% for drawn tube) and naturally aged. The products receive no further straightening after stretching.

T4511

Same as T4510 except that minor straightening is allowed after stretching to comply with standard tolerances.

T452

Solution heat-treated, stress-relieved by compressing to produce a permanent set of 1% to 5% and naturally aged.

T454

Solution heat-treated, stress-relieved by restriking cold in the finish die and naturally aged.

T5

Cooled from an elavated temperature shaping process and then artificially aged.

T51

Cooled from an elavated temperature shaping process and then artificially aged in underageing conditions to improve formability.

T56

Cooled from an elevated temperature shaping process and then artificially aged - mechanical property level higher than T5 achieved through special control of the process (6000 series alloys).

T6

Solution heat-treated and then artificially aged.

T61

Solution heat-treated and then artificially aged in underageing conditions to improve formability.

T6151

Solution heat-treated, stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate) and then artificially aged in underageing conditions to improve formability. The products receive no further straightening after stretching.

T62

Solution heat-treated and then artificially aged. Applies to test material heat-treated from annealed or F temper or to products heat-treated from any temper by the user.

T64

Solution heat-treated and then artificially aged in underageing conditions (between T6 and T61) to improve formability.

T651

Solution heat-treated, stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for rolled or cold-finished rod and bar, 1% to 5% for hand or ring forging and rolled ring) and then artificially aged. The products receive no further straightening after stretching.

T6510

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for extruded rod, bar, shapes and tube, 0.5% to 3% for drawn tube) and then artificially aged. The products receive no further straightening after stretching.

T6511

Same as T6510 except that minor straightening is allowed after stretching to comply with standard tolerances.

T652

Solution heat-treated, stress-relieved by compressing to produce a permanent set of 1% to 5% and then artificially aged.

T654

Solution heat-treated, stress-relieved by restriking cold in the finish die and then artificially aged.

T66

Solution heat-treated and then artificially aged - mechanical property level higher than T6 achieved through special control of the process (6000 series alloys)..

T7

Solution heat-treated and then artificially overaged.

T73

Solution heat-treated and then artificially overaged in order to achieve the best stress corrosion resistance.

T732

Solution heat-treated and then artificially overaged in order to achieve the best stress corrosion resistance. Applies to test material heat-treated from annealed or F temper or to products heat-treated from any temper by the user.

T7351

Solution heat-treated, stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for rolled or cold-finished rod and bar, 1% to 5% for hand or ring forging and rolled ring) and then artificially overaged in order to achieve the best stress corrosion resistance. The products receive no further straightening after stretching.

T73510

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for extruded rod, bar, shapes and tube, 0.5% to 3% for drawn tube) and then artificially overaged in order to achieve the best stress corrosion resistance. The products receive no further straightening after stretching.

T73511

Same as T73510 except that minor straightening is allowed after stretching to comply with standard tolerances.

T7352

Solution heat-treated, stress-relieved by compressing to produce a permanent set of 1% to 5% and then artifi-cially overaged in order to achieve the best stress corrosion resistance.

T7354

Solution heat-treated, stress-relieved by restriking cold in the finish die and then artificially overaged in order to achieve the best stress corrosion resistance.

T74

Solution heat-treated and then artificially overaged (between T73 and T76).

T7451

Solution heat-treated, stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for rolled or cold-finished rod and bar, 1% to 5% for hand or ring forging and rolled ring) and then artificially overaged (between T73 and T76). The products receive no further straightening after stretching.

T74510

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for extruded rod, bar shapes and tube 0.5% to 3% for drawn tube) and then artificially overaged (between T73 and T76). The pro-ducts receive no further straightening after stretching.

T74511

Same as T74510 except that minor straightening is allowed after stretching to comply with standard tolerances.

T7452

Solution heat-treated, stress-relieved by compressing to produce a permanent set of 1% to 5% and then artifi-cially overaged (between T73 and T76).

T7454

Solution heat-treated, stress-relieved by restriking cold in the finish die and then artificially overaged (bet-ween T73 and

T76

Solution heat-treated and then artificially overaged in order to achieve a good exfoliation corrosion resistance.

T761

Solution heat-treated and then artificially overaged in order to achieve a good exfoliation corrosion resistan-ce. (applies to 7475 sheet and strip).

T762

Solution heat-treated and then artificially overaged in order to achieve a good exfoliation corrosion resistan-ce. Applies to test material heat-treated from annealed or F temper or to products heat-treated from any tem-per by the user.

T7651

Solution heat-treated, stress-relieved by controlled stretching (permanent set 0.5% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for rolled or cold-finished rod and bar, 1% to 5% for hand or ring forging and rolled ring) and then artificially overaged in order to achieve a good exfoliation corrosion resistance. The products recieve no further straightening after

T76510

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for extruded rod, bar, shapes and tube, 0.5% to 3% for drawn tube) and then artificially overaged in order to achieve a good exfoli-ation corrosion resistance. The products receive no further straightening after stretching.

T76511

Same as T76510 except that minor straightening is allowed after stretching to comply with standard tolerances.

T7452

Solution heat-treated, stress-relieved by compressing to produce a permanent set of 1% to 5% and then artifi-cially overaged in order to achieve a good exfoliation corrosion resistance.

T7454

Solution heat-treated, stress-relieved by restriking in the finish die and then artificially overaged in order to achieve a good exfoliation corrosion resistance.

T79

Solution heat-treated and then artificially overaged (very limited overageing).

T79510

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for extruded rod, bar, shapes and tube, 0.5% to 3% for drawn tube) and then artificially overaged (very limited overageing). The products receive no further straightening after stretching.

T8

Solution heat-treated, cold worked and then artificially aged.

T82

Solution heat-treated by the user, controlled stretched with a minimum permanent set of 2% and then artifi-cially aged (alloy 8090).

T832

Solution heat-treated, cold worked a controlled specific amount and then artificially aged (applies to 6063 drawn tube).

T841

Solution heat-treated, cold worked and then artificially underaged (sheet and strip in alloys 2091 and 8090).

T851

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for sheet, 1.5% to 3% for plate, 1% to 3% for rolled or cold-finished rod and bar, 1% to 5% for hand or ring forging and rolled ring) and then artificially aged. The products receive no further straightening after stretching.

T8510

Solution heat-treated, stress-relieved by controlled stretching (permanent set 1% to 3% for extruded rod, bar, profiles and tube, 0.5% to 3% for drawn tube) and then artificially aged. The products receive no further straightening after stretching.

T8511

Same as T8510 except for minor straightening is allowed after stretching to comply with standard tolerances.

T852

Solution heat-treated, stress-relieved by compressing to produce a permanent set of 1% to 5% and then artifi-cially aged.

T854

Solution heat-treated, stress-relieved by restriking cold in the finish die and then artificially aged.

T86

Solution heat-treated, cold worked approximately 6% and then artificially aged.

T87

Solution heat-treated, cold worked approximately 7% and then artificially aged.

T89

Solution heat-treated, cold worked to an appropriate degree to achieve the specified mechanical properties and then artificially aged.

T9

Solution heat-treated, artificially aged and then cold worked.

Search