ASTM · ASTM B135

Seamless brass tubes: profile and round according to ASTM B135 standard

Technical parameters and standards for seamless copper alloy tubes

This specification regulates the production and supply of seamless tubes of measured and non-measured cross-sections (round, square, rectangular) manufactured from brass alloys. EV Group China products comply with international quality standards, ensuring high precision in geometric dimensions and stability of chemical composition.

Nominal chemical composition, %		Nominal chemical composition, %	Nominal chemical composition, %	Previously used designationA	UNS Alloy
...	...	10.0	90.0	7	C22000
...	...	15.0	85.0	1	C23000
...	...	30.0	70.0	2	C26000
...	...	35.0	65.0	9	C27000
...	...	37.0	63.0	8	C27200
...	...	37.5	62.5	...	C27400
...	...	40.0	60.0	5	C28000
...	0.5	33.5	66.0	3	C33000
...	1.6	32.4	66.0	4	C33200
...	1.0	39.0	60.0	6	C37000
1.00	...	27.5	71.5	...	C44300
Titanium Nitride	Lead	Zinc	Copper	Previously used designationA	UNS Alloy

A – historical alloy designations according to standard B135–63 (ASTM, 1966).

The quality control technological process at EV Group China includes mandatory testing for the absence of residual mercury traces, which can trigger intergranular corrosion and negatively impact operational performance. Each batch of tubes undergoes comprehensive non-destructive testing: eddy current testing, as well as hydrostatic and pneumatic leak tests.