October 23, 2020

Alloy Steel G20Mn5 ( EN 1.6220)

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

Impeller Casting, investment Casting

Our Services

  1. Sand Casting

    Casting Quality focus on Metal Parts industry, we provide professional service in Metal Casting field.

    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.

  2. 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

  3. 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.

  4. CNC Machining

    CNC Milling, CNC turning with 5 xix CNC center, we provide precision machining for all castings based on customers design drawings.

  5. CAD Design

    Mechanical Design service based on customers requirement, our software is Solidworks and AutoCAD.

  6. Tools/Mold Design

    Mould design and production will be served for metal casting ad plastic injection industry. Based on our more than 10 years experience, we supply professional molds for our customers in Europe and North American.

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)
EN 10293 G20Mn51.62200.17-0.231.00-1.600.600.0200.0200.80
EN 10340 G20Mn51.62200.17-0.231.00-1.600.600.0200.0200.30.120.8
EN 10213 G20Mn51.62200.17-0.231.00-1.600.600.0200.0200.80

For Casings of ruling Thickness <28mm, 0.030% S is permitted
EN 10240 G20Mn5 required: V ≤0.03, Cu ≤0.30; total Cr+Mo+Ni+V+Cu ≤1%

G20Mn5 (EN 1.6220) Heat treatment processwww.castingquality.com
Normalizing, or Quenching and Temper

Steel Grade

Heat TreatmentThickness

mm, max

Test At room temperatureImpact Test
Tensile Test, minTemperature
SymbolQuenching (+Q)Tempering (+T)Rp0.2






KVJ minAt °C
EN 10293  G20Mn5+ N900-98030300480-6202027-30
+ QT900-940610-660100300500-6502227-40
EN 10240  G20Mn5+ N900-98030300480-6202027-30
+ QT900-940610-660100300500-6502227-40
EN 10213 G20Mn5+ N900-98030300480-6202027-30
+ QT900-940610-660100300500-6502227-40

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.

Metal Castings

Alloy Steel , , , ,
About China Castings
sand casting, investment casting, CNC machining and other castings from Chinese foundry
One Comment
  1. Hi, I would like to ask if the A% in the tensile test section is Elongation% or Reduction of Area%?

Leave a Reply

Your email address will not be published. Required fields are marked *

error: Alert: Thanks for your interesting, but Article is protected ! You can click the Top Right email!