Stainless Steel R20033 Forged+A
Heat-treated state
UNS R20033 · ASTM B912 · EN X1NiCrMoCuN32-28-7
Forged+A = forged + Annealed
Valve bodies, flanges and fittings; always re-annealed after forging to dissolve intermetallics and restore corrosion resistance.
Values for the Forged+A condition
Other R20033 tempers and conditions
R20033 is listed in 5 conditions; see the grade overview at R20033.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Forged+AThis page Forged + Annealed | Valve bodies, flanges and fittings; always re-annealed after forging to dissolve intermetallics and restore corrosion resistance. | 420 | 780 | 42 | 195 HB | 1.9 % IACS |
AnnealedDefault solution annealed and quenched (plate, sheet, bar, tube) | Standard delivery condition for all corrosion-service product forms; maximum corrosion resistance and ductility. | 430 | 800 | 45 | 200 HB | 1.9 % IACS |
As-welded deposit | Fabricated weldment condition; matching filler keeps N and Cr high so weld metal corrosion performance is close to base metal. | 450 | 760 | 30 | 210 HB | 1.9 % IACS |
Cold drawn | Pick for bar and small tubing where tighter tolerance, straightness and higher yield strength are wanted. | 620 | 900 | 28 | 25 HRC | 1.9 % IACS |
Cold rolled strip, hard temper | Thin strip/spring-type applications needing maximum strength; corrosion service still good but formability is minimal. | 800 | 1,050 | 12 | 32 HRC | 1.9 % IACS |
What is R20033 Forged+A?
R20033 Forged+A is R20033 heat treated to Forged+A — valve bodies, flanges and fittings; always re-annealed after forging to dissolve intermetallics and restore corrosion resistance. R20033 Forged+A has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi). R20033 Forged+A has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F). Annealed is the default condition FabDigit quotes; Forged+A is available on request or by drawing note.
Advantages
- Good corrosion resistance — 91/100, better than 99% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
Limitations
- Poor heat conductor — 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- High embodied carbon — 6 kg CO₂/kg, worse than 88% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
R20033 Forged+A properties
Typical room-temperature values for R20033 Forged+A; 22 are specific to this condition. Other listed values are R20033 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
R20033 Forged+A has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
R20033 Forged+A has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
R20033 Forged+A is rated for continuous service to 450°C (842 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades. Thermal expansion is 14.5 µm/m·K (8.06 µin/in·°F).
Electrical3
R20033 Forged+A conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (91/100), better than 99% of stainless steel grades.
Sustainability4
Producing a kilogram of R20033 Forged+A takes about 85 MJ of energy and emits 6 kg of CO₂ — more than 92% of stainless steel grades. Typical recycled content is 40%.
Manufacturability7
R20033 Forged+A's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability very good (70/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with R20033 Forged+A
Is R20033 easy to machine?
Machine like a superaustenitic/nickel alloy: rigid setup, positive-rake sharp carbide, low speed with heavy positive feed, flood coolant, and never dwell — the high-N austenite work-hardens fast and gums up.
Can R20033 be welded?
GTAW/GMAW/PAW with matching Alloy 33 (or overalloyed Ni-Cr-Mo) filler, low heat input, no preheat, interpass below ~150 °C; avoid autogenous welds losing N and avoid slow cooling through 700–900 °C.
Can R20033 be formed, bent or molded?
Excellent cold ductility but forming loads roughly double those of 316L; hot work 1100–1200 °C followed by mandatory solution anneal ~1080–1150 °C and rapid quench.
What surface finishes work on R20033?
Pickle in HNO3-HF or electropolish to remove weld scale, then passivate in nitric acid; polishes to bright mirror finish and takes no anodize (not aluminium).
R20033 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 |
|---|---|---|
| Cr | 31 – 35 | 33 |
| Ni | 30 – 33 | 31 |
| Mo | 0.5 – 2 | 1.6 |
| Cu | 0.3 – 1.2 | 0.6 |
| Nnitrogen strengthening + pitting resistance | 0.35 – 0.6 | 0.45 |
| C | ≤ 0.02 | 0.01 |
| Mn | ≤ 2 | 0.5 |
| Si | ≤ 0.5 | 0.3 |
| P | ≤ 0.03 | — |
| S | ≤ 0.01 | — |
| Febalance, typically 30–33 % | balance | — |
R20033 Forged+A — frequently asked
What is R20033 Forged+A used for?
R20033 Forged+A is typically used for phosphoric and sulfuric acid production, sour gas and oilfield equipment, chemical process reactors and flue gas desulfurization. In short: 33% Cr acid-service austenitic; beyond 6% Mo grades; oxidizing and reducing acids.
What is the yield strength of R20033 Forged+A?
R20033 Forged+A has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is R20033 Forged+A easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Machine like a superaustenitic/nickel alloy: rigid setup, positive-rake sharp carbide, low speed with heavy positive feed, flood coolant, and never dwell — the high-N austenite work-hardens fast and gums up.
Can R20033 Forged+A be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/PAW with matching Alloy 33 (or overalloyed Ni-Cr-Mo) filler, low heat input, no preheat, interpass below ~150 °C; avoid autogenous welds losing N and avoid slow cooling through 700–900 °C.
What surface finishes work on R20033 Forged+A?
Pickle in HNO3-HF or electropolish to remove weld scale, then passivate in nitric acid; polishes to bright mirror finish and takes no anodize (not aluminium).
Can R20033 Forged+A be formed, bent or molded?
Excellent cold ductility but forming loads roughly double those of 316L; hot work 1100–1200 °C followed by mandatory solution anneal ~1080–1150 °C and rapid quench.
What is the maximum service temperature of R20033 Forged+A?
R20033 Forged+A is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between R20033 Annealed and R20033 CR-Hard?
Annealed is the default condition — standard delivery condition for all corrosion-service product forms; maximum corrosion resistance and ductility. CR-Hard: thin strip/spring-type applications needing maximum strength; corrosion service still good but formability is minimal. Yield strength is 430 MPa in Annealed versus 800 MPa in CR-Hard.
Sources
- VDM Alloy 33 / Nicrofer 3033 material data sheet — VDM Metals (2020)
- ASTM B625 — Ni-Fe-Cr-Mo alloy plate, sheet and strip (UNS R20033) — ASTM International (2020)
- ASTM B649 — Ni-Fe-Cr-Mo-Cu alloy bar and wire — ASTM International (2021)
- EN 10088-2 / EN 10028-7 — X1NiCrMoCuN32-28-7 (1.4591) — CEN (2017)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
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.