Steel P355ML2
EN 1.8833, 10028-6
P355ML2 (1.8833) is a thermomechanically rolled fine-grain pressure vessel plate to EN 10028-6 with the stricter L2 toughness class, qualified for service down to -50 °C instead of the -40 °C of ML1.
Reference datasheet — P355ML2 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
P355ML2 tempers and conditions
P355ML2 is supplied in 5 conditions, soft to hard. TM is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M (TMCP as-delivered), t > 63–100 mm | Maximum thickness range of EN 10028-5; reduced strength band, confirm −50 °C impacts at 1/4 t. | 345 | 500 | 25 | 148 HB | 9 % IACS |
M (TMCP as-delivered), t > 40–63 mm | Heavy plate for thick-wall vessels; slightly lower guaranteed yield and toughness scatter. | 370 | 510 | 25 | 150 HB | 9 % IACS |
M + SR | Choose when the fabricated vessel requires PWHT; keep temperature/time low, strength loss must be verified by simulated-PWHT coupons. | 370 | 505 | 27 | 148 HB | 9 % IACS |
M (TMCP as-delivered), t > 16–40 mm | Medium plate gauges; minimum yield drops one step per EN 10028-5 thickness grading. | 380 | 515 | 26 | 152 HB | 9 % IACS |
TMDefault M (TMCP as-delivered), t ≤ 16 mm | Standard stocked condition: thermomechanically rolled plate in the as-delivered state, thin gauges with full 355 MPa yield. | 390 | 520 | 26 | 155 HB | 9 % IACS |
Supply forms, finishes and certifications
Ways P355ML2 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, TMCP as-delivered | Certification |
What is P355ML2?
P355ML2 (1.8833) is a thermomechanically rolled fine-grain pressure vessel plate to EN 10028-6 with the stricter L2 toughness class, qualified for service down to -50 °C instead of the -40 °C of ML1. Typical plate properties are 390 MPa yield, 520 MPa tensile, 26 % elongation and 155 HB, with a low carbon equivalent that keeps welding straightforward in thicknesses to 100 mm. The TMCP structure does not survive hot forming or normalizing above about 580 °C, and the bare surface needs a coating system. Maximum service temperature is 400 °C; P355ML1 is the cheaper choice when only -40 °C toughness is required. P355ML2 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F). P355ML2 has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 64% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
What is P355ML2 used for?
- cryogenic pressure vessels
- arctic gas equipment
- chemical tanks
Advantages
- Readily welded — 92/100, better than 93% of steel grades
- Forms and bends easily — 75/100, better than 90% 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
P355ML2 properties
Typical room-temperature values for P355ML2-TM; bars are the position among steel grades.
Physical3
P355ML2 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,500°C (2,732 °F).
Mechanical16
P355ML2 has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 64% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P355ML2 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
P355ML2 conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of P355ML2 takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
P355ML2's machinability is good (60/100, better than 83% of steel grades); weldability excellent (92/100); formability very good (75/100).
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. P355ML2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with P355ML2
Is P355ML2 easy to machine?
Machines like low-carbon HSLA plate (~55 % of AISI 1212): use positive-rake coated carbide, high feed and coolant to avoid gummy built-up edge.
Can P355ML2 be welded?
Excellent weldability thanks to low CEV; SAW/GMAW/SMAW with low-hydrogen, matching or slightly overmatching Ni-bearing consumables, control heat input and interpass ≤250 °C to preserve −50 °C toughness.
Can P355ML2 be formed, bent or molded?
Cold form/roll freely (A≥22 %); avoid hot forming or normalizing above ~580 °C — it destroys the TMCP structure and the guaranteed properties must then be re-established by heat treatment.
P355ML2 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, EN 10028-5 | ≤ 0.16 | 0.09 |
| Si | ≤ 0.5 | 0.3 |
| Mn | 0.9 – 1.7 | 1.45 |
| P | ≤ 0.02 | 0.01 |
| SL2 level requires very low S for −50 °C toughness | ≤ 0.01 | 0 |
| Altotal Al, grain refinement | ≥ 0.02 | 0.04 |
| NbNb+V+Ti ≤ 0.22 | ≤ 0.05 | 0.03 |
| V | ≤ 0.1 | 0.04 |
| Ti | ≤ 0.05 | 0.02 |
| Crresidual | ≤ 0.3 | 0.05 |
| Nioften added to aid low-T toughness | ≤ 0.5 | 0.15 |
| Moresidual | ≤ 0.1 | 0.02 |
| Curesidual | ≤ 0.3 | 0.05 |
| N | ≤ 0.02 | 0.01 |
| Fe | balance |
What surface finishes work on P355ML2?
No inherent corrosion resistance: shot-blast to Sa 2½ then epoxy/zinc-rich paint, metallize or galvanize; anodizing is not applicable.
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 P355ML2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.883310028-6
How much does P355ML2 cost?
P355ML2 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
P355ML2 — frequently asked
What is P355ML2 used for?
P355ML2 is typically used for cryogenic pressure vessels, arctic gas equipment and chemical tanks. In short: -50 °C toughness class; low CEV, easy welding; stricter ML1 upgrade.
What is the yield strength of P355ML2?
P355ML2 has a typical yield strength of 390 MPa (56.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 64% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is P355ML2 easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like low-carbon HSLA plate (~55 % of AISI 1212): use positive-rake coated carbide, high feed and coolant to avoid gummy built-up edge.
Can P355ML2 be welded?
Yes — weldability is rated excellent (92/100). Excellent weldability thanks to low CEV; SAW/GMAW/SMAW with low-hydrogen, matching or slightly overmatching Ni-bearing consumables, control heat input and interpass ≤250 °C to preserve −50 °C toughness.
What surface finishes work on P355ML2?
No inherent corrosion resistance: shot-blast to Sa 2½ then epoxy/zinc-rich paint, metallize or galvanize; anodizing is not applicable.
Can P355ML2 be formed, bent or molded?
Cold form/roll freely (A≥22 %); avoid hot forming or normalizing above ~580 °C — it destroys the TMCP structure and the guaranteed properties must then be re-established by heat treatment.
What is the maximum service temperature of P355ML2?
P355ML2 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does P355ML2 cost?
P355ML2 is a budget-cost steel ($), 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: weldable fine grain steels, thermomechanically rolled — CEN (2017)
- EN 10164 — Steel products with improved deformation properties perpendicular to the surface (Z-quality) — CEN (2018)
- EN 10027-2 — Designation systems for steels: numerical system (1.8833) — CEN (2015)
- EN 1011-2 — Welding recommendations for ferritic steels — CEN (2001)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- EN 13445-3 — Unfired pressure vessels: design (material physical properties) — CEN (2021)
- worldsteel LCI data for steel plate — World Steel Association (2023)
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.