December 3, 2018

Carbon Steel BS3100 GR A3

Carbon steel Grade A3 is one British steel casting material, which is a popular steel material in casting purpose.

BS3100 standard which is superseded by BS EN10293:2005.

Similar Casting Steel: ZG270-450; ASTM A27 Gr.70-40[485-275]; SC450(SC46); GS-52; GS60;GE300

BS 3100:1991 Specification for steel castings for general engineering purposes

BS 3100 Grade A3 Casting Chemical Requirements and Mechanical Property:
Carbon: 0.45max
Manganese: 1.00 max
Silicon: 0.60 max
Sulfur: 0.050 max
Phosphorus: 0.050 max

Tensile Strength: 540Mpa min
Yield Strength: 295Mpa min
Elongation: 14.0% min
Charpy V-notch: 18J @ 20° C.

BS3100 Gr A3 Casting Heat treatment process: Generally all castings need to be annealed or normalized; or N+T; or OQ+T; or WQ+T

A – For anneal by heating to a temperature above the AC3 and cool in the furnace.
N – For normalize by heating to a temperature above AC3 and cool in the still air.
OQ – For quench into oil from a temperature above AC3
WQ – For Quench into water from a temperature above AC3
AH – For air harden by heating to a temperature above AC3 and cool in air at a rate fast enough to produce a hardened microstructure
T – For temper by heating to a temperature below AC1.
ST – For solution treat by heating to a temperature high enough to dissolve carbides and any into intermetallic phases followed by a rapid cool.

Steel Manufacture Process: Sand Casting, Precision Lost Wax Investment Casting.

Our Services

  1. 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. 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 and Titanium alloy by investment casting. It can achieve the best appearance with good tolerance

  3. 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. 4
    Rapid Prototyping.

    3D Printing and Rapid Prototyping service.

    3D Scanning by physical sample.

  5. 5
    CNC Machining

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

  6. 6
    CAD/CAM Design

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

  7. 7
    Tools/Molds 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.


What makes Casting Quality the best?


Our engineers are more than just designers….they’re pioneers. Our team use CAD/CAM to do the simulation of casting parts .Through the advanced technology, we can know the weight and structure . We also visited so many factories to know their difference and improve our products every year.


We’re obsessed with quality. Casting Quality constantly strives to exceed our customers’ expectations in durability and performance. In fact, we will control the whole process from the original material to the finished parts , include the technology .Uniquely-designed Quality Control System focuses on ensuring four product goals: 1) Eligible Chemistry , 2) Hardness 3) Property and 4) Affordable Pricing. The result is the best casting products value in the industry.


We’re in Qingdao,China, It has convenient transportation of road and sea. Courteous service is part of who we are, and we do it better than anyone in the industry. With Casting Quality you can expect friendly, knowledgeable, and prompt customer service.


Shipping orders complete and on-time is of paramount importance to our customers. We will count the delivery date and result before accept your order.  Casting Quality consistently ranks as one of the best in speed of delivery and fill rates.

Metal Castings

Carbon Steel
About China Castings
sand casting, investment casting, CNC machining and other castings from Chinese foundry

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