The 1.1169 steel grade
1.1169 is the EN material number, or Werkstoffnummer, for the steel grade 20Mn6. European standards classify it as a non-alloy special steel. The manganese content of 1.30 to 1.60% is added for strength and hardenability rather than as an alloying system, so the grade is normally described as a carbon-manganese steel and not as a low-alloy steel.
Low carbon together with raised manganese gives 1.1169 good toughness at sub-zero temperatures and sound weldability. The published application for the grade is high-pressure vessels and tubes for service down to minus 100 °C, which is where it is most often specified: pressure equipment, cold-service process plant and heavy machinery forgings.
This page sits under alloy steel in our site navigation. Under EN classification 1.1169 is a non-alloy special steel. Use that description in a specification or enquiry.
Chemical composition of 1.1169 / 20Mn6
Chemical composition, percentage by weight. Ladle analysis, with product analysis tolerances per the applicable standard.
| Element | Symbol | Min % | Max % |
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| Carbon | C | 0.17 | 0.23 |
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| Silicon | Si | 0.30 | 0.60 |
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| Manganese | Mn | 1.30 | 1.60 |
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| Phosphorus | P | – | 0.035 |
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| Sulphur | S | – | 0.035 |
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| Iron | Fe | Balance |
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We can melt 1.1169 to a tightened composition window, for example restricted sulphur for better through-thickness ductility, or a specified carbon equivalent for welded fabrication. State the requirement on the enquiry and it goes into the melt specification.
1.1169 equivalent grades
Comparable designations for 1.1169. Equivalence is indicative. Confirm against the standard and product form you are ordering to.
| Standard or country | Designation |
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| EN material number | 1.1169 |
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| DIN and EN, Germany | 20Mn6 |
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| NF, France | 20M5 |
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| BS, United Kingdom | 150M19 |
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| ISO | 22Mn6 |
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If your drawing calls out a national grade that is not listed here, send the specification with the enquiry. We forge to ASTM, AMS, AISI, API 6A, DIN, EN and JIS designations, and we confirm in writing whether 1.1169 is an acceptable substitution before any material is melted.
Heat treatment and hot working
Processing temperatures for 1.1169 / 20Mn6.
| Operation | Temperature | Notes |
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| Hot working | 850-1100 °C | Forging finished above the recrystallisation range to close porosity and refine grain. |
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| Normalising | 860-890 °C | Air cool. A common delivery condition for pressure parts. |
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| Hardening | 860-890 °C | Water quench. |
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| Tempering | 500-650 °C | Selected to meet the strength and impact values on the order. |
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Furnaces are computer controlled with calibrated multi-point thermocouples. Each heat-treatment batch produces a time and temperature chart, which is supplied with the certificate. Annealing, normalising, and quench and temper are all carried out in house, so heat treatment adds no subcontract lead time to an order.
Testing and certification
Mechanical properties of a forging depend on section size, delivery condition and the standard being ordered to, so we do not publish one set of figures for 1.1169. The properties below are measured on your material and reported on the certificate.
Standard test scope for 1.1169 forgings. Further testing is available on request.
| Test | Reported as | Typical method |
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| Chemical analysis | Full element breakdown, ladle and product | Optical emission spectrometry |
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| Tensile | Rp0.2, Rm, elongation A, reduction of area Z | EN ISO 6892-1 |
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| Impact toughness | Charpy V-notch energy at specified temperature, down to minus 100 °C | EN ISO 148-1 |
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| Hardness | Brinell HBW | EN ISO 6506 |
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| Ultrasonic examination | Acceptance class agreed on order | EN 10228-3 |
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| Magnetic particle | Surface indication report | EN 10228-1 |
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| Grain size | ASTM grain size number | ASTM E112 |
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| Dimensional | Report against your drawing | CMM and manual gauging |
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Documents supplied with an order
- EN 10204 3.1 inspection certificate, issued with every order as standard.
- EN 10204 3.2 certificate witnessed by a third party (TUV, SGS, BV, Lloyd's Register) or by your own inspector, on request.
- Traceability from heat number to finished piece, with the heat number hard stamped or vibro etched on the forging.
- Heat-treatment charts, NDT reports and dimensional reports as part of the document pack.
- Pre-production sample or first article inspection for series work.
Forging capability
Open-die forging and ring rolling capability at Jiangyin Jiangnan Metal.
| Parameter | Capability |
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| Diameter | 100 mm to 6000 mm |
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| Piece weight | 10 kg to 15,000 kg |
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| Length | 100 mm to 12,000 mm |
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| Forging hammers | 1 t, 3 t, 6 t, 9 t |
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| Hydraulic press | 4500 t |
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| Ring rolling mills | 3 m and 6 m |
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| Melting routes | EAF + LF + VD, ESR, VIM + ESR + VAR |
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| Engineering staff | 9 senior, 32 intermediate engineers |
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How a 1.1169 forging is made
- Melting and ingot supplySteel is melted to the 1.1169 composition. Where the application calls for low inclusion content, the ingot is refined by electroslag remelting before it goes to the forge shop.
- Open-die forgingThe ingot is upset and drawn on a hammer or on the 4500 t press to a forging ratio that breaks down the cast structure. Rings are pierced and rolled on the 3 m or 6 m mill.
- Heat treatmentNormalising, or quench and temper at 860 to 890 °C and 500 to 650 °C, in calibrated furnaces with a recorded temperature chart.
- MachiningRough or finish machining to your drawing, including bores, faces, steps and gear blank profiles.
- Testing and releaseChemical, mechanical, ultrasonic and dimensional inspection, then release with the EN 10204 certificate.
Applications for 1.1169
- Pressure equipment. High-pressure vessel shells, heads, nozzles and heat exchanger tube sheets.
- Low-temperature service. Components specified for operation down to minus 100 °C, including LPG and process gas equipment.
- Boilers and piping. Forged pipe, fittings and flanges for steam and process circuits.
- Valves. Bodies, bonnets, stems and seat rings where toughness and weldability matter more than hardness.
- Heavy machinery. Shafts, gear blanks, sleeves and housings in gearboxes, compressors and mill equipment.
- Oil and gas surface equipment. General structural and pressure-containing forgings outside sour service.
1.1169 is not a sour-service grade. For H2S environments that require NACE MR0175 or ISO 15156 compliance, ask us about AISI 4130 or AISI 8630.
What to send with an enquiry
A drawing plus these five items is enough for a firm price and lead time, usually within one working day.
- Drawing or dimensioned sketch in PDF, DWG or STEP.
- Quantity, and whether this is a one-off, a batch or an annual requirement.
- Delivery condition: as forged, normalised, or quenched and tempered.
- Machining state: with allowance, rough machined, or finish machined.
- Testing and certificate level, plus any customer or third-party inspection requirement.
If you are not sure whether 1.1169 suits your part, send the operating pressure, temperature and medium and our engineers will propose a grade.
Common questions about 1.1169
What is steel 1.1169?
1.1169 is the European material number for the carbon-manganese steel 20Mn6, a non-alloy special steel containing 0.17 to 0.23% carbon and 1.30 to 1.60% manganese. It is used for high-pressure vessels and tubes at service temperatures down to minus 100 °C, and is normally supplied quenched and tempered.
What is the equivalent grade of 1.1169?
1.1169 is the material number for DIN and EN 20Mn6. Comparable designations are NF 20M5 in France, BS 150M19 in the United Kingdom and ISO 22Mn6. Confirm equivalence against the standard and product form you are ordering to.
Is 1.1169 an alloy steel or a carbon steel?
1.1169 (20Mn6) is classified in EN as a non-alloy special steel. Its manganese content of 1.30 to 1.60% is a strengthening addition, so the grade is described as a carbon-manganese steel rather than a low-alloy steel.
Who supplies 1.1169 forgings?
Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, supplies 1.1169 (20Mn6) forged bars, seamless rolled rings, shafts, discs, sleeves and tube sheets made to customer drawing. Telephone +86 189 2135 9659, email sales@steelforgepieces.com.
What sizes and weights of 1.1169 forgings can be produced?
Jiangyin Jiangnan Metal produces 1.1169 forgings from 100 mm to 6000 mm in diameter, 10 kg to 15,000 kg in weight and up to 12,000 mm in length, using 1, 3, 6 and 9 tonne forging hammers, a 4500 tonne hydraulic press and 3 m and 6 m ring rolling mills.
What heat treatment is applied to 1.1169?
1.1169 (20Mn6) is hardened from 860 to 890 °C with a water quench and tempered at 500 to 650 °C. Hot working is carried out between 850 and 1100 °C. Normalising and annealing are also available depending on the properties required.
What material certificate is supplied with 1.1169 forgings?
Every order is supplied with an EN 10204 3.1 inspection certificate as standard. An EN 10204 3.2 certificate witnessed by a third party such as TUV, SGS, BV or Lloyd's Register can be arranged on request.
What is 1.1169 used for?
1.1169 (20Mn6) is used for high-pressure vessel and boiler components, low-temperature service parts down to minus 100 °C, heat exchanger tube sheets, valve bodies and bonnets, flanges, shafts, gear blanks and general machinery forgings that need good toughness and weldability.
Request a quotation for 1.1169 forgings
Send your drawing and we will come back with price, lead time and the proposed manufacturing and testing route. Enquiries are answered in English and Chinese, usually within one working day.
Jiangyin Jiangnan Metal Co., Ltd.
No.1 Chengxiqiao Road, Zhouzhuang Town
Jiangyin City, Jiangsu Province, China
Phone, WhatsApp, WeChat: +86 189 2135 9659
Email: sales@steelforgepieces.com
