Printed from Kezuriba (kezuriba.net/en/materials/ti-6242/)
Ti-6Al-2Sn-4Zr-2Mo
ISO S (heat-resistant alloys & titanium)Near-alpha titanium alloy (heat resistant). Number: UNS R54620. Standard: AMS 4975 (bars, wire, rings) / AMS 4976 (forgings) / AMS 4919 (sheet, strip). The current titles all include 0.08Si (= the composition of Ti-6242S).
🌐JIS and international equivalents
“Close” means composition or properties are not exactly the same. Before substituting, check the values in each standard.
| System | Designation | Number | Relation | Confidence |
|---|---|---|---|---|
| UNS | Ti-6Al-2Sn-4Zr-2Mo | UNS R54620 | — | |
| WL (German aerospace material number) | 3.7144 | WL 3.7144 | Equivalent (listed together by the manufacturer in the standards column) | One source / reference[3] |
| JIS | — | — | Not confirmed | |
| GB | — | — | Not confirmed | |
| EN | — | — | Not confirmed |
Differences between the equivalents (from the sources)
- WL (German aerospace material number) 3.7144: Aubert & Duval's standards column only. A second source was not confirmed
- JIS : No JIS equivalent (not found in primary sources)
- GB : An aggregated database lists TA19 (Ti-6Al-2Sn-4Zr-2Mo-0.1Si) as the corresponding grade, but it is not confirmed in primary sources, so the field is left blank
- EN : The EN aerospace standard number is not confirmed
📄Related specifications (AMS, ASTM etc.)
Specifications called up on purchase orders and drawings. AMS are SAE aerospace material specifications, split by product form (bar, plate, forging), melting practice and heat treatment. Standard texts are paid, so only titles and scopes checked on the publishers’ public pages are shown.
| Spec | Scope | Confidence |
|---|---|---|
| AMS 4975 | Titanium Alloy, Bars, Wire, and Rings, 6.0Al - 2.0Sn - 4.0Zr - 2.0Mo - 0.08Si, Solution and Precipitation Heat TreatedBars, wire and flash-welded rings (diameter ≤3.00 in, cross-sectional area ≤16 in²), solution treatment + precipitation treatment. The current edition is AMS4975R (revised 2025-09-12) | Agrees in 2+ sources[9][10] |
| AMS 4976 | Titanium Alloy, Forgings, 6.0Al 2.0Sn 4.0Zr 2.0Mo, Solution and Precipitation Heat TreatedForgings and forging stock, solution treatment + precipitation treatment. Titles from edition M onward include "- 08Si" (as written on the SAE page); the current edition is N (2025-09-12) | One source / reference[11][12][13] |
| AMS 4919 | Titanium Alloy Sheet, Strip, and Plate, 6Al - 2Sn - 4Zr - 2Mo - 0.08Si, Duplex AnnealedSheet, strip and plate, duplex annealed | One source / reference[14] |
| MIL-T-9047G | Bars and billets (heat-treated material). Listed in the specification column by ATI. The English title was not confirmed on a public page. MIL-T-9047 is said to have moved to AMS-T-9047, but this is not confirmed | One source / reference[1][2] |
| AMS-T-9046 | Sheet and strip (Comp. AB-4 in the MIL-HDBK-5J table, triplex annealed material). The English title was not confirmed on a public page | One source / reference[4][15] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
✈Main aerospace uses (as stated in the sources)
- Gas turbine engine compressor parts (blades, disks, impellers) are the main application[8][2][3]
- As sheet, engine afterburner structures and airframe skins that become hot[8][2]
- The most widely used high-temperature titanium alloy in jet engine compressors and airframe structures (from the description in TIMET's alloy list)[16]
⚗Chemical composition (mass %)
Ranges differ between specifications, so each one has its own column (dark figures agree in several sources, light figures come from one source).
| Element | Spec ① | Spec ② |
|---|---|---|
| Al | 5.5 – 6.5[8] | — |
| Sn | 1.8 – 2.2[8] | — |
| Zr | 3.6 – 4.4[8] | — |
| Mo | 1.8 – 2.2[8] | — |
| Si (6242S) | 0.06 – 0.13[8] | — |
| Fe | ≤ 0.25[8] | — |
| O | ≤ 0.15[8] | — |
| C | ≤ 0.08[8] | — |
| N | ≤ 0.05[8] | — |
| H | ≤ 0.0125[8] | — |
| Others (each / total) | ≤ 0.10 / 0.40[8] | — |
| Ti | — | Balance[8][1] |
- Spec ① Composition table of the TIMET datasheet (TIMETAL 6-2-4-2)
- Spec ② TIMET, ATI, Aubert & Duval
⚖Density
4.54 g/cm³
Agrees in 2+ sources[8][2][3][4]
TIMET, ATI and Aubert & Duval give 4.54, and MIL-HDBK-5J gives 0.164 lb/in³ (= 4.54). The beta transus is 995°C ±15 for TIMET, 995°C ±15 for ATI and 996°C for Aubert & Duval
Calculate weight in Ti-6Al-2Sn-4Zr-2Mo →💪Mechanical properties
“Reference” values are not specified minimums from the standard but figures published by makers and others.
| Condition | Tensile MPa | Yield MPa | Elong. % | Hardness | Type of value |
|---|---|---|---|---|---|
| Solution treatment + precipitation treatment (STA, duplex annealing), bars (thickness or diameter ≤3.000 in, cross-sectional area ≤16 in²) | ≥ 896 (130ksi) | ≥ 827 (120ksi) | ≥ 10 | — | Design allowable, S-basis (MIL-HDBK-5J Table 5.3.3.0(c), material of AMS 4975; the S-basis corresponds to the minimum value of the specification). The LT and ST directions are for a transverse dimension of 2.500 in One source / reference[4] |
| Solution treatment + precipitation treatment (STA, duplex annealing), forgings (thickness ≤3.000 in, cross-sectional area ≤9 in²) | ≥ 896 (130ksi) | ≥ 827 (120ksi) | ≥ 10 | — | Design allowable, S-basis (MIL-HDBK-5J Table 5.3.3.0(c), material of AMS 4976) One source / reference[4] |
| Duplex annealed (DA), sheet (thickness 0.046–0.187 in) | ≥ 931 (135 ksi, S-basis) / B-basis 986 (143 ksi) | ≥ 862 (125 ksi, S-basis) / B-basis 938 (136 ksi, L direction) | ≥ 8–10 (8 for 0.025–0.062 in, 10 for over 0.062 in) | — | Design allowable (MIL-HDBK-5J Table 5.3.3.0(b), material of AMS 4919; the A-basis is the S-basis value, and the B-basis is a statistical value) One source / reference[4] |
| Annealed at 1,800°F (982°C), bars and billets | ≥ 1035 (150ksi) | ≥ 966 (140ksi) | ≥ 15 | <=28 HRC | Manufacturer's minimum value notation (ATI product page; which standard the value belongs to is not stated. Only MIL-T-9047G is listed in the specification column) One source / reference[1] |
| 970°C × 1 h air cooled + 595°C × 8 h air cooled, round bars (diameter 38 mm / 28 mm / 18 mm), room temperature | 1004 / 1018 / 1045 | 895 / 895 / 955 | 19 / 19 / 18 | — | Typical value (TIMET datasheet Table 6). For the 18 mm diameter, the UTS ksi column is misprinted as "104", so the MPa column value of 1045 is adopted One source / reference[8] |
| Heat-treated material, room temperature | 1000 | 940 | 15 (5d) | — | Typical value (Aubert & Duval; stated explicitly as not a guaranteed value) One source / reference[3] |
| Duplex annealed | — | — | — | 32–36 HRC | Typical value (ATI technical datasheet) One source / reference[2] |
| Tensile specified values in the text of the AMS standards (sheet, bars, forgings) | — | — | — | — | Specified value (AMS 4975 / 4976 / 4919). The text of the standards is paid, so it was not checked directly. The S-basis values of MIL-HDBK-5J are used as a substitute Not confirmed |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- atimaterials.com https://www.atimaterials.com/Products/ati-6-2-4-2
- atimaterials.com https://www.atimaterials.com/Products/Documents/datasheets/titanium/alloyed/ati_6-2-4-2_td…
- aubertduval.com https://www.aubertduval.com/wp-content/uploads/2024/12/Ti6242_1_GB-1.pdf
- everyspec.com https://everyspec.com/MIL-HDBK/MIL-HDBK-0001-0099/MIL_HDBK_5J_139/
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- sumitool.com https://www.sumitool.com/downloads/cutting-tools/general-catalog/assets/pdf/a.pdf#page=18
- iscar.co.za https://iscar.co.za/Catalogs/Publication/english_1/machining_titanium/machining_titanium_0…
- timet.com https://www.timet.com/documents/datasheets/near-alpha-alloys/timetal-6242.pdf
- sae.org https://www.sae.org/standards/content/ams4975/
- saemobilus.sae.org https://saemobilus.sae.org/standards/ams4975r-titanium-alloy-bars-wire-rings-60al-20sn-40z…
- sae.org https://www.sae.org/standards/content/ams4976/
- sae.org https://www.sae.org/standards/content/ams4976m/
- saemobilus.sae.org https://saemobilus.sae.org/standards/ams4976-titanium-alloy-forgings-6al-2sn-4zr-2mo-solut…
- sae.org https://www.sae.org/standards/content/ams4919/
- saemobilus.sae.org https://saemobilus.sae.org/standards/amst9046-titanium-titanium-alloy-sheet-strip-plate
- timet.com https://www.timet.com/assets/local/documents/technicalmanuals/TiAlloys.pdf
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