Steel P420ML2 TM+SR
Heat-treated state
EN 1.8828, 10028-6
Choose when the vessel requires post-weld heat treatment; keep temperature and hold time within the producer's limits to avoid strength/toughness loss.
Values for the TM+SR condition
Other P420ML2 tempers and conditions
P420ML2 is listed in 4 conditions; see the grade overview at P420ML2.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
TM | Heavy plate limit of the grade; lower guaranteed strength and slightly reduced through-thickness toughness. | 420 | 545 | 24 | 165 HB | 8 % IACS |
TM | Medium-thickness plate; yield minimum steps down to 400 MPa with the same low-temperature impact requirement. | 435 | 560 | 25 | 170 HB | 8 % IACS |
TM+SRThis page thermomechanically rolled and stress relieved / PWHT (typ. 530–580 °C) | Choose when the vessel requires post-weld heat treatment; keep temperature and hold time within the producer's limits to avoid strength/toughness loss. | 435 | 550 | 26 | 165 HB | 8 % IACS |
TMDefault Thermomechanically rolled, as-delivered | Standard mill delivery condition for thin/medium plate; full 420 MPa minimum yield and −50 °C toughness. | 455 | 570 | 25 | 175 HB | 8 % IACS |
What is P420ML2 TM+SR?
P420ML2 TM+SR is P420ML2 heat treated to TM+SR — choose when the vessel requires post-weld heat treatment; keep temperature and hold time within the producer's limits to avoid strength/toughness loss. P420ML2 TM+SR has a yield strength of 435 MPa (63.1 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 50% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi). P420ML2 TM+SR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). TM is the default condition FabDigit quotes; TM+SR is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 155 MPa·√m (141.1 ksi·√in), better than 97% of steel grades
- Forms and bends easily — 74/100, better than 89% of steel grades
- Readily welded — 88/100, better than 87% of steel grades
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
P420ML2 TM+SR properties
Typical room-temperature values for P420ML2 TM+SR; 23 are specific to this condition. Other listed values are P420ML2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
P420ML2 TM+SR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical16
P420ML2 TM+SR has a yield strength of 435 MPa (63.1 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 50% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P420ML2 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
P420ML2 TM+SR conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of P420ML2 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
P420ML2 TM+SR's machinability is good (60/100, better than 83% of steel grades); weldability excellent (88/100); formability very good (74/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with P420ML2 TM+SR
Is P420ML2 easy to machine?
Machines like a tough HSLA plate at roughly 60 % of AISI 1212 — use rigid setups, positive-rake coated carbide and generous feed to break the stringy chips.
Can P420ML2 be welded?
Excellent weldability thanks to low CEV; use low-hydrogen consumables matched to −50 °C toughness and control heat input (typically ≤ 2.5–3.5 kJ/mm) to protect the TMCP HAZ.
Can P420ML2 be formed, bent or molded?
Cold-forms and rolls well with generous bend radii (≈2–3 t); hot forming above ~580 °C destroys the thermomechanical structure and requires re-qualification.
What surface finishes work on P420ML2?
No anodizing — shot-blast and paint, metallize or hot-dip galvanize; avoid galvanizing temperatures/holds that exceed the producer's PWHT window.
P420ML2 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 maximum | ≤ 0.18 | 0.1 |
| Si | ≤ 0.5 | 0.3 |
| Mn | 1 – 1.7 | 1.5 |
| Ptighter for ML2 sub-grade | ≤ 0.03 | 0.01 |
| Slow S for low-temperature toughness | ≤ 0.02 | 0 |
| Altotal Al, grain refinement | ≥ 0.02 | 0.04 |
| Nb | ≤ 0.05 | 0.03 |
| Ti | ≤ 0.05 | 0.02 |
| VNb+Ti+V ≤ 0.22 % | ≤ 0.1 | 0.04 |
| Cr | ≤ 0.3 | 0.05 |
| Ni | ≤ 0.8 | 0.25 |
| Mo | ≤ 0.25 | 0.06 |
| Cu | ≤ 0.7 | 0.2 |
| N | ≤ 0.03 | 0.01 |
| Fe | balance | — |
P420ML2 TM+SR — frequently asked
What is P420ML2 TM+SR used for?
P420ML2 TM+SR is typically used for cryogenic vessels, LPG tanks and arctic pressure equipment. In short: arctic-rated vessel plate; L2 low-temperature toughness; Z35 through-thickness quality.
What is the yield strength of P420ML2 TM+SR?
P420ML2 TM+SR has a typical yield strength of 435 MPa (63.1 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 50% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is P420ML2 TM+SR easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like a tough HSLA plate at roughly 60 % of AISI 1212 — use rigid setups, positive-rake coated carbide and generous feed to break the stringy chips.
Can P420ML2 TM+SR be welded?
Yes — weldability is rated excellent (88/100). Excellent weldability thanks to low CEV; use low-hydrogen consumables matched to −50 °C toughness and control heat input (typically ≤ 2.5–3.5 kJ/mm) to protect the TMCP HAZ.
What surface finishes work on P420ML2 TM+SR?
No anodizing — shot-blast and paint, metallize or hot-dip galvanize; avoid galvanizing temperatures/holds that exceed the producer's PWHT window.
Can P420ML2 TM+SR be formed, bent or molded?
Cold-forms and rolls well with generous bend radii (≈2–3 t); hot forming above ~580 °C destroys the thermomechanical structure and requires re-qualification.
What is the maximum service temperature of P420ML2 TM+SR?
P420ML2 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, Part 5: Weldable fine grain steels, thermomechanically rolled — CEN (2017)
- EN 10164 — Steel products with improved deformation properties perpendicular to the surface — CEN (2018)
- EN 10025-4 / EN 10027-2 designation and material-number system — CEN (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- TMCP pressure-vessel plate datasheets (P355M–P460ML2 family) — European plate mills (2022)
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.