G20Mn5 is one type low alloy cast steel for low temperature application, it’s listed in casting standard of EN 10293, EN 10340 and EN 10213-3, the En number is 1.6220. And it’s similar as ASTM A148 Grade 80-50. Castingquality.com
G20Mn5 Casting Methods in Casting Quality Industrial:
- Sand Casting
- Investment Casting (Lost Wax Casting, Precision Casting)
G20Mn5 Equivalent Steel material grade: www.castingquality.com
ASTM A148 Gr 80-50
DIN 17182 GS-20Mn5 (WNr 1.1120)
Chinese casting grade: ZG20SiMn
Reference Casting Standards:
BS EN 10293:2015 Steel castings. Steel castings for general engineering uses
DIN EN 10293:2015-04 Steel castings – Steel castings for general engineering uses
EN 10213-1: Technical delivery conditions for steel castings for pressure purposes – Part 1. General
EN 10213-3: Technical delivery conditions for steel castings for pressure purposes – Part 3: Steel grades for use at low temperatures
EN 10340: Steel castings for structural uses.
G20Mn5 (EN 1.6220) Physical Properties:
Density: 7.8 kgs/dm3
Specific heat: 460 J(kg-k) at 20 °C
Thermal conductivity: 45 W/(m-K) at 50 °C
Mean thermal expansion: 13.0 10-6k-1 from 20°C up to 100°C
13.8 10-6k-1 from 20°C up to 100°C
15 10-6k-1 from 20°C up to 100°C
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- Sand Casting
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Sand Casting is a popular metal form method, are suitable for all materiel, such as grey iron, ductile iron, malleable iron, carbon steel, stainless steel, aluminum and bronze.
- Investment Casting
also named as precision lost wax casting, mainly suitalbe for carbon steel and stainless steel parts. We also provide grey iron and ductile iron and aluminum and bronze parts by investment casting. It can achieve the best appearance with good tolerance
- Shell Casting
Shell casting method is a good option to replace investment casting and sand casting. the quality is better than sand casting parts, suitable for bulk production.
- CNC Machining
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G20Mn5 (EN 1.6220) Chemistry Property:www.castingquality.com
Steel Grade | G20Mn5 (EN 1.6620) Chemical Composition / Physical Properties % (max, except where range is given) | ||||||||
| Name | Number | Carbon | Manganese | Silicon | Sulfur | Phosphorus | Chromium | Molybdenum | Ni |
| EN 10293 G20Mn5 | 1.6220 | 0.17-0.23 | 1.00-1.60 | 0.60 | 0.020 | 0.020 | – | – | 0.80 |
| EN 10340 G20Mn5 | 1.6220 | 0.17-0.23 | 1.00-1.60 | 0.60 | 0.020 | 0.020 | 0.3 | 0.12 | 0.8 |
| EN 10213 G20Mn5 | 1.6220 | 0.17-0.23 | 1.00-1.60 | 0.60 | 0.020 | 0.020 | – | – | 0.80 |
For Casings of ruling Thickness <28mm, 0.030% S is permitted | |||||||||
G20Mn5 (EN 1.6220) Heat treatment process: www.castingquality.com
Normalizing, or Quenching and Temper
Steel Grade | Heat Treatment | Thickness mm, max | Test At room temperature | Impact Test | |||||
| Tensile Test, min | Temperature | ||||||||
| Symbol | Quenching (+Q) | Tempering (+T) | Rp0.2 MPa | Rm MPa | A % | KVJ min | At °C | ||
| EN 10293 G20Mn5 | + N | 900-980 | – | 30 | 300 | 480-620 | 20 | 27 | -30 |
| 50 | RT | ||||||||
| + QT | 900-940 | 610-660 | 100 | 300 | 500-650 | 22 | 27 | -40 | |
| 60 | RT | ||||||||
| EN 10240 G20Mn5 | + N | 900-980 | – | 30 | 300 | 480-620 | 20 | 27 | -30 |
| 50 | RT | ||||||||
| + QT | 900-940 | 610-660 | 100 | 300 | 500-650 | 22 | 27 | -40 | |
| 60 | RT | ||||||||
| EN 10213 G20Mn5 | + N | 900-980 | 30 | 300 | 480-620 | 20 | 27 | -30 | |
| + QT | 900-940 | 610-660 | 100 | 300 | 500-650 | 22 | 27 | -40 | |
1. +Q means: Quenching in air or liquid. 2. +N means: Normalizing. 3. 1MPa = 1 N/MM2. 4. RT: Room Temperature. | |||||||||
G20Mn5 (EN 1.6220) Steel Mechanical Property www.castingquality.com
G20Mn5 (EN 1.6220) Welding conditions:
Preheated temperature 20 to 150 °C, max interpass temperature 350°C, no post weld heat treatment requirement.
G20Mn5 (EN 1.6220) Typical Casting Application:
- Pump Castings.
- Valve Castings.
- Turbines Castings: Francis Blade, Runner Crown, and Wicket Gates.
- Steam Boilers
- Heat Exchanger System.
Hi, I would like to ask if the A% in the tensile test section is Elongation% or Reduction of Area%?