For realizing lead-free automobiles and electrical equipment
To address growing demand for lead-free automobiles and electrical equipment, UACJ supplies the lead-free aluminum alloy ECOMASHINAROI. Lead is typically added to aluminum alloy to enhance scrap processability, but in recent years its use has been restricted due to environmental concerns.
CB156 is an ideal substitute for alloy 2011, which contains lead.
CB256 is designed for use in environments where temperatures are 100˚C or above and is effective as a substitute for alloy 2017.
- Chip treatability
CB156 offers the same machinability as alloy 2011, which has had lead added.
CB256 demonstrates superior chip treatability to alloy 2017.
- Mechanical properties
CB156 and CB256 offer strength that is close to that of alloy 2011.
* Depending on the usage environment, there are some cases where the use of lead-free free-machining alloys is not appropriate. Please discuss this with us in advance.
- Alumite treatability
GT209 offers superior alumite treatability at the same level as AA6.
|CB156||0.4 or less||0.7 or less||4.5–6.0||-||-||-||0.3 or less||-||-||Bi+Sn=
|bal.||Lead-free, tin added|
|CB256||0.4 or less||0.7 or less||4.5–6.0||-||-||-||0.3 or less||-||-||0.6–1.8||-||bal.||Lead-free, tin-free|
|2011||0.4 or less||0.7 or less||5.0–6.0||-||-||-||0.3 or less||-||0.2–0.6||0.2–0.6||-||bal.||Lead added|
|2017||0.2–0.8||0.7 or less||3.5–4.5||0.4–1.0||0.4–0.8||0.1 or less||0.25 or less||0.15 or less||-||-||-||bal.||Material in general use|
Types and mechanical properties of aluminum alloys for use in free machining
|Alloy series||Material temper||Lead content
(% of mass)
|Mechanical properties||Chip treatability||Surface treatability||Corrosion resistance||Toughness at high temperatures|
|2000 series lead-free material||CB156-T8||-||420||320||15||◎||△||△||〇–△|
|2000 series traditional material||2011-T8||0.6||440||330||15||◎||△||△||〇|
|6000 series lead-free material||GT209-T6||-||310||270||14||◎||◎||〇||〇|
*◎: Extremely good 〇: Good △: Fairly poor ×: Poor
External appearance of chips after machining