Steel P420ML2
EN 1.8828, 10028-6
P420ML2 is a thermomechanically rolled pressure vessel steel to EN 10028-6 (1.8828) in the L2 toughness class, delivering 455 MPa yield, 570 MPa tensile, 25 % elongation and 175 HB in the default TM condition with guaranteed impact toughness at very low temperature.
Reference datasheet — P420ML2 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the TM condition
P420ML2 tempers and conditions
P420ML2 is supplied in 4 conditions, soft to hard. TM is the default FabDigit quotes; the values on this page are for it.
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 |
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 |
Supply forms, finishes and certifications
Ways P420ML2 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Z35 | Through-thickness (Z-quality) tested plate per EN 10164 | Certification |
What is P420ML2?
P420ML2 is a thermomechanically rolled pressure vessel steel to EN 10028-6 (1.8828) in the L2 toughness class, delivering 455 MPa yield, 570 MPa tensile, 25 % elongation and 175 HB in the default TM condition with guaranteed impact toughness at very low temperature. It is used for cryogenic and arctic-service vessels, supplied as plate in TM bands to 63 mm plus TM+SR stress-relieved and Z35 through-thickness qualities. Service temperature is limited to 400 °C, the steel needs a protective coating, and hot forming above about 580 °C destroys the TMCP condition. P420M is the choice when low-temperature toughness is not required. P420ML2 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). P420ML2 has a yield strength of 455 MPa (66 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 54% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
What is P420ML2 used for?
- cryogenic vessels
- LPG tanks
- arctic pressure equipment
Advantages
- Tough — resists crack growth — 160 MPa·√m (145.6 ksi·√in), better than 98% of steel grades
- Forms and bends easily — 72/100, better than 88% of steel grades
- Readily welded — 88/100, better than 87% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
P420ML2 properties
Typical room-temperature values for P420ML2-TM; bars are the position among steel grades.
Physical3
P420ML2 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 has a yield strength of 455 MPa (66 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 54% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P420ML2 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 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 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's machinability is good (58/100, better than 75% of steel grades); weldability excellent (88/100); formability very good (72/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. P420ML2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with P420ML2
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.
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 |
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.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel P420ML2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.882810028-6
How much does P420ML2 cost?
P420ML2 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
P420ML2 — frequently asked
What is P420ML2 used for?
P420ML2 is typically used for cryogenic vessels, LPG tanks and arctic pressure equipment. In short: arctic-rated vessel plate; L2 low-temperature toughness; Z35 through-thickness quality.
What is the yield strength of P420ML2?
P420ML2 has a typical yield strength of 455 MPa (66 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 54% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is P420ML2 easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like a tough HSLA plate at roughly 60 % of AISI 1212 — use rigid setups, positive-rake coated carbide and generous feed to break the stringy chips.
Can P420ML2 be welded?
Yes — weldability is rated excellent (88/100). Excellent weldability thanks to low CEV; use low-hydrogen consumables matched to −50 °C toughness and control heat input (typically ≤ 2.5–3.5 kJ/mm) to protect the TMCP HAZ.
What surface finishes work on P420ML2?
No anodizing — shot-blast and paint, metallize or hot-dip galvanize; avoid galvanizing temperatures/holds that exceed the producer's PWHT window.
Can P420ML2 be formed, bent or molded?
Cold-forms and rolls well with generous bend radii (≈2–3 t); hot forming above ~580 °C destroys the thermomechanical structure and requires re-qualification.
What is the maximum service temperature of P420ML2?
P420ML2 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does P420ML2 cost?
P420ML2 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.