Steel P460ML1 TM+SR
Heat-treated state
EN 1.8837, 10028-6
TM+SR = tM + stress relieved / PWHT
Choose when code-required PWHT or heavy welding stress relief is applied; expect a modest strength drop, so verify simulated-PWHT test coupons.
Values for the TM+SR condition
Other P460ML1 tempers and conditions
P460ML1 is listed in 5 conditions; see the grade overview at P460ML1.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
TM | Maximum thickness range normally supplied; use where thick TMCP plate with -40 °C toughness is required. | 425 | 560 | 22 | 170 HB | 8.6 % IACS |
TM | Heavy plate for thick shells and nozzles; lower strength band and slightly lower toughness scatter band. | 450 | 580 | 22 | 175 HB | 8.6 % IACS |
TM+SRThis page TM + stress relieved / PWHT | Choose when code-required PWHT or heavy welding stress relief is applied; expect a modest strength drop, so verify simulated-PWHT test coupons. | 470 | 590 | 24 | 175 HB | 8.6 % IACS |
TM | Medium-thickness plate for vessel shells; slightly reduced guaranteed yield strength. | 480 | 605 | 23 | 180 HB | 8.6 % IACS |
TMDefault Thermomechanically rolled, t ≤ 16 mm | Standard as-rolled TMCP delivery condition for thin plate; highest guaranteed strength band. | 505 | 615 | 23 | 185 HB | 8.6 % IACS |
What is P460ML1 TM+SR?
P460ML1 TM+SR is P460ML1 heat treated to TM+SR — choose when code-required PWHT or heavy welding stress relief is applied; expect a modest strength drop, so verify simulated-PWHT test coupons. P460ML1 TM+SR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 590 MPa (85.6 ksi) — stronger than 57% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi). P460ML1 TM+SR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F). TM is the default condition FabDigit quotes; TM+SR is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 170 MPa·√m (154.7 ksi·√in), better than 98% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
- Readily welded — 86/100, better than 85% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
P460ML1 TM+SR properties
Typical room-temperature values for P460ML1 TM+SR; 22 are specific to this condition. Other listed values are P460ML1 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
P460ML1 TM+SR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F).
Mechanical16
P460ML1 TM+SR has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 590 MPa (85.6 ksi) — stronger than 57% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P460ML1 TM+SR is rated for continuous service to 400°C (752 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
P460ML1 TM+SR conducts electricity at 8.6 % IACS, better than 66% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of P460ML1 TM+SR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
P460ML1 TM+SR's machinability is fair (54/100, better than 54% of steel grades); weldability excellent (86/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with P460ML1 TM+SR
Is P460ML1 easy to machine?
Machines like a 600 MPa HSLA plate — use rigid setups, coated carbide at moderate speeds; drilling and edge planing are routine but expect more tool load than S355.
Can P460ML1 be welded?
Excellent weldability at CEV ≤ 0.47; use low-hydrogen consumables matching 460 MPa yield, control heat input (typ. 1.0–2.5 kJ/mm) to protect the TMCP HAZ toughness, and minimise/avoid unnecessary PWHT.
Can P460ML1 be formed, bent or molded?
Cold forming and roll bending are good (min. bend radius ~2t transverse); hot forming above about 580 °C destroys the TMCP condition, so any hot work must be followed by requalification or an agreed heat treatment.
What surface finishes work on P460ML1?
No anodizing; protect by shot blasting plus epoxy/PU coating, metallizing or hot-dip galvanizing — the bare surface rusts as fast as ordinary carbon steel.
P460ML1 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cladle analysis max, EN 10028-5 | ≤ 0.16 | 0.1 |
| Si | ≤ 0.6 | 0.35 |
| Mn | 1 – 1.7 | 1.55 |
| PML1 grade tightened vs. M | ≤ 0.02 | 0.01 |
| Slow S for low-temperature toughness / Z-quality | ≤ 0.01 | 0 |
| Altotal Al, grain refinement | ≥ 0.02 | 0.04 |
| NbNb+V+Ti ≤ 0.22 | ≤ 0.05 | 0.04 |
| V | ≤ 0.12 | 0.05 |
| Ti | ≤ 0.05 | 0.02 |
| Cr | ≤ 0.3 | 0.1 |
| Niaids -40 °C toughness | ≤ 0.8 | 0.3 |
| Mo | ≤ 0.2 | 0.08 |
| Cu | ≤ 0.7 | 0.15 |
| N | ≤ 0.03 | 0.01 |
| B | ≤ 0.01 | 5×10⁻⁴ |
| Febalance; CEV typically ≤ 0.45–0.47 | balance | — |
P460ML1 TM+SR — frequently asked
What is P460ML1 TM+SR used for?
P460ML1 TM+SR is typically used for cryogenic tanks, arctic process vessels and chemical plant equipment. In short: high-toughness TMCP pressure plate; 460 MPa yield, low preheat; L1 cold-service grade.
What is the yield strength of P460ML1 TM+SR?
P460ML1 TM+SR has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 590 MPa (85.6 ksi) — stronger than 57% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is P460ML1 TM+SR easy to machine?
Reasonably — machinability is rated fair (54/100, better than 54% of steel grades). Machines like a 600 MPa HSLA plate — use rigid setups, coated carbide at moderate speeds; drilling and edge planing are routine but expect more tool load than S355.
Can P460ML1 TM+SR be welded?
Yes — weldability is rated excellent (86/100). Excellent weldability at CEV ≤ 0.47; use low-hydrogen consumables matching 460 MPa yield, control heat input (typ. 1.0–2.5 kJ/mm) to protect the TMCP HAZ toughness, and minimise/avoid unnecessary PWHT.
What surface finishes work on P460ML1 TM+SR?
No anodizing; protect by shot blasting plus epoxy/PU coating, metallizing or hot-dip galvanizing — the bare surface rusts as fast as ordinary carbon steel.
Can P460ML1 TM+SR be formed, bent or molded?
Cold forming and roll bending are good (min. bend radius ~2t transverse); hot forming above about 580 °C destroys the TMCP condition, so any hot work must be followed by requalification or an agreed heat treatment.
What is the maximum service temperature of P460ML1 TM+SR?
P460ML1 TM+SR is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10028-5 — Flat products made of steels for pressure purposes: weldable fine grain steels, thermomechanically rolled — CEN (2017)
- EN 10164 — Steel products with improved deformation properties perpendicular to the surface — CEN (2018)
- EN 10027-2 — Designation systems for steels: numerical system (1.8837) — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Thermomechanically rolled pressure vessel plate datasheets (P355M–P460ML2) — European plate mills (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.