brass

Copper-zinc basis

Record evidence supporting a copper-zinc alloy identity, including additions and unresolved classification boundaries.

1. What measured composition supports identifying this material as brass rather than another copper alloy? measurement
2. Which designation system resolves the alloy family if its commercial name or additional elements make classification ambiguous? boundary

Representative identification

Record how coatings, plating, tarnish or selective corrosion affect the representativeness of identification evidence.

1. Does the brass identification describe the bulk material, a plated layer or only the tested surface? boundary
2. What examination or sampling evidence distinguishes the surface composition from the underlying alloy? measurement

Traceable grade claim

Record the claimed grade, its governing specification and the evidence linking it to this item or lot.

1. Which brass designation, standard and edition are claimed, and which certificate or test supports that claim? provenance
2. How is the assessed piece linked to the heat, lot or sample represented by that evidence? provenance

Present metallurgical state

Record product route, temper and available property or microstructure evidence without inferring them from colour or grade alone.

1. What casting, cold-working, annealing or subsequent heating history establishes the present condition? provenance
2. Which hardness, strength, ductility or microstructure observations verify the condition needed for the proposed action? measurement

Dezincification evidence

Record observations and tests that distinguish superficial discolouration from selective zinc loss and porous material.

1. What evidence distinguishes tarnish or deposited material from suspected or confirmed dezincification? measurement
2. How far does affected material extend, and what sound section remains within the limits of the inspection? measurement

Stress-corrosion assessment

Record crack evidence, residual or applied stress and relevant chemical exposure, including ammonia-bearing environments where applicable.

1. What cracking has been detected, by which method, and with what inspection coverage? measurement
2. What stress and exposure history supports investigating stress-corrosion cracking rather than assigning a cause from appearance alone? provenance

Operation suitability

Record evidence for proposed deformation or cutting operations, including relevant alloy additions and condition changes.

1. What grade- and temper-specific evidence supports the proposed bend, draw, forge or machining operation? action
2. What post-operation checks are needed to establish acceptable cracking, hardness and ductility? measurement

Treatment compatibility

Record an applicable treatment procedure and its implications for zinc, alloy additions, temper and coatings.

1. What procedure supports the proposed joining or heating action for this brass, including control of zinc loss and relevant emissions? action
2. Which cleaning or finishing method is compatible with the brass, any coating and the observed corrosion condition? action

Application-specific acceptance

Record compatibility evidence, applicable material requirements and unresolved limits for the proposed service.

1. What evidence supports this brass grade and condition in the specified medium, temperature, stress and contacting-metal combination? boundary
2. For a regulated contact use, which applicable requirements and test or certification evidence establish material acceptance? action

Chemistry-aware disposition

Record remaining condition, alloy segregation, attached materials and contamination relevant to reuse or recycling.

1. What evidence supports reuse while preserving knowledge of the brass grade, condition and previous exposure? action
2. Which alloy additions, coatings, attached metals or contaminants determine segregation and acceptance by the intended recycler? boundary

Kinds and varieties

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these kinds and varieties hold for the sense of brass this model covers, and on what evidence? provenance

Identifiers and schemes

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these identifiers and schemes hold for the sense of brass this model covers, and on what evidence? provenance

Standards and regulation

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these standards and regulation hold for the sense of brass this model covers, and on what evidence? provenance

Real-world use

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these real-world use hold for the sense of brass this model covers, and on what evidence? provenance

Typical measurements

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these typical measurements hold for the sense of brass this model covers, and on what evidence? provenance

Failure modes and hazards

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these failure modes and hazards hold for the sense of brass this model covers, and on what evidence? provenance

Regional variation

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these regional variation hold for the sense of brass this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Reported by the breadth pass; each item needs checking against its source before it becomes normative.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of brass this model covers, and on what evidence? provenance