Steel Dillidur 400V-SR (Stress relieved)
Heat-treated state
GB NM400
Use after heavy flame cutting or welding of large fabrications; low-temperature stress relief only — anything above ~250 °C tempers away the wear hardness.
Values for the SR condition
Other Dillidur 400V tempers and conditions
Dillidur 400V is listed in 3 conditions; see the grade overview at Dillidur 400V.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Q&T 400 HB, heavy plate | Pick for thick liners and heavy structures; surface hardness is maintained but core hardenability, toughness and CEV-driven weldability are less favourable. | 1,000 | 1,200 | 11 | 41 HRC | 7.8 % IACS |
SRThis page Stress relieved | Use after heavy flame cutting or welding of large fabrications; low-temperature stress relief only — anything above ~250 °C tempers away the wear hardness. | 1,080 | 1,220 | 11 | 42 HRC | 7.8 % IACS |
QT-400HBDefault quenched and tempered, as-delivered wear plate (t ≤ 50 mm) | Standard stocked condition: water-quenched and tempered plate at 360–440 HB for general abrasion service. | 1,100 | 1,250 | 10 | 43 HRC | — |
What is Dillidur 400V-SR?
Dillidur 400V-SR is Dillidur 400V heat treated to SR — use after heavy flame cutting or welding of large fabrications; low-temperature stress relief only — anything above ~250 °C tempers away the wear hardness. Dillidur 400V-SR has a yield strength of 1,080 MPa (157 ksi) and a tensile strength of 1,220 MPa (177 ksi) — stronger than 93% of steel grades. Elongation at break is 11% and the elastic modulus is 210 GPa (30.5 Msi). Dillidur 400V-SR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). QT-400HB is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- High strength — 1,080 MPa (157 ksi), better than 93% of steel grades
Limitations
- Difficult to machine — 29/100, worse than 90% of steel grades
- Limited ductility — 11%, worse than 89% of steel grades
- Limited service temperature — 250°C (482 °F), worse than 85% of steel grades
- Hard to polish — 45/100, worse than 84% of steel grades
Dillidur 400V-SR properties
Typical room-temperature values for Dillidur 400V-SR; 22 are specific to this condition. Other listed values are Dillidur 400V reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
Dillidur 400V-SR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
Dillidur 400V-SR has a yield strength of 1,080 MPa (157 ksi) and a tensile strength of 1,220 MPa (177 ksi) — stronger than 93% of steel grades. Elongation at break is 11% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
Dillidur 400V-SR is rated for continuous service to 250°C (482 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 69% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
Dillidur 400V-SR conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of Dillidur 400V-SR takes about 26 MJ of energy and emits 2.2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 25%.
Manufacturability5
Dillidur 400V-SR's machinability is poor (29/100, worse than 90% of steel grades); weldability good (58/100); formability poor (33/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Dillidur 400V-SR
Is Dillidur 400V easy to machine?
Machine at 400 HB with rigid setups, negative-rake coated carbide or CBN, low speeds and heavy feeds; drilling needs high thrust and coolant, and plasma/laser-cut edges should be dressed before machining.
Can Dillidur 400V be welded?
Weldable with low-hydrogen consumables (softer than base metal is acceptable); control preheat (typically 100–175 °C by thickness/CEV), keep interpass below ~225 °C and limit heat input to protect the HAZ hardness.
Can Dillidur 400V be formed, bent or molded?
Cold bendable with generous radii (about 3–4× thickness, bend axis transverse to rolling direction) on high-tonnage presses; no hot forming above ~250 °C without full re-hardening.
What surface finishes work on Dillidur 400V?
Shot-blast and paint or use a corrosion-resistant liner coating for outdoor/wet duty; hard chrome or thermal spray is unnecessary and hot-dip galvanizing risks tempering and hydrogen issues.
Dillidur 400V 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, thickness dependent | ≤ 0.2 | 0.16 |
| Si | ≤ 0.8 | 0.35 |
| Mn | ≤ 1.7 | 1.3 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | ≤ 1 | 0.5 |
| Nihigher in heavy gauges for hardenability | ≤ 1 | 0.3 |
| Mo | ≤ 0.5 | 0.2 |
| Bboron treated for hardenability | ≤ 0.01 | 0 |
| Fe | balance | — |
Dillidur 400V-SR — frequently asked
What is Dillidur 400V-SR used for?
Dillidur 400V-SR is typically used for earthmoving equipment, wear liners and agricultural machinery. In short: 400 HB weldable wear plate; hardox 400 class alternative; stress-relieved option available.
What is the yield strength of Dillidur 400V-SR?
Dillidur 400V-SR has a typical yield strength of 1,080 MPa (157 ksi) and a tensile strength of 1,220 MPa (177 ksi) — stronger than 93% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is Dillidur 400V-SR easy to machine?
Not especially — machinability is rated poor (29/100, worse than 90% of steel grades). Machine at 400 HB with rigid setups, negative-rake coated carbide or CBN, low speeds and heavy feeds; drilling needs high thrust and coolant, and plasma/laser-cut edges should be dressed before machining.
Can Dillidur 400V-SR be welded?
Yes — weldability is rated good (58/100). Weldable with low-hydrogen consumables (softer than base metal is acceptable); control preheat (typically 100–175 °C by thickness/CEV), keep interpass below ~225 °C and limit heat input to protect the HAZ hardness.
What surface finishes work on Dillidur 400V-SR?
Shot-blast and paint or use a corrosion-resistant liner coating for outdoor/wet duty; hard chrome or thermal spray is unnecessary and hot-dip galvanizing risks tempering and hydrogen issues.
Can Dillidur 400V-SR be formed, bent or molded?
Cold bendable with generous radii (about 3–4× thickness, bend axis transverse to rolling direction) on high-tonnage presses; no hot forming above ~250 °C without full re-hardening.
What is the maximum service temperature of Dillidur 400V-SR?
Dillidur 400V-SR is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Dillidur 400V QT-400HB and Dillidur 400V-SR?
QT-400HB is the default condition — standard stocked condition: water-quenched and tempered plate at 360–440 HB for general abrasion service. SR: use after heavy flame cutting or welding of large fabrications; low-temperature stress relief only — anything above ~250 °C tempers away the wear hardness. Yield strength is 1,100 MPa in QT-400HB versus 1,080 MPa in SR.
Sources
- Dillidur 400V abrasion-resistant plate data sheet — AG der Dillinger Hüttenwerke (2020)
- GB/T 24186 High-strength wear-resistant steel plate (NM400) — SAC (2022)
- 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)
- Hardox 400 data sheet (class benchmark for cross-check) — SSAB (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.