title = "Metal Grades and Industry Standards (ASTM, DIN, JIS)"

content = """
Metal materials used at Ridgecrest Metalworks are specified according to internationally recognized
standards that define chemical composition, mechanical property requirements, dimensional tolerances,
and testing requirements. Understanding these standards is essential for procurement, incoming inspection,
and compliance with customer specifications.

ASTM International (formerly American Society for Testing and Materials):
ASTM is the dominant standards body for metals in North American industrial markets. ASTM standards
cover a wide range of product forms. Key standards relevant to Ridgecrest operations:
- ASTM A36: Carbon structural steel in plate, bar, and structural shapes
- ASTM A108: Cold-finished carbon and alloy steel bar
- ASTM A193: Alloy steel bolting for high-temperature service (Grade B7 is the most common)
- ASTM A216/A217: Steel castings for pressure-retaining service
- ASTM B209: Aluminum alloy sheet and plate
- ASTM B283: Copper and copper alloy die forgings

DIN (Deutsches Institut für Normung):
DIN standards are used by European customers and equipment manufacturers. Steel grades are designated
with a materials number (e.g., 1.4301 for 304 stainless steel) or a compositional shorthand (e.g.,
X5CrNi18-10). When customer drawings specify DIN grades, Ridgecrest engineering must verify the
equivalent domestic or ASTM grade and document the cross-reference on the traveler.

JIS (Japanese Industrial Standards):
JIS steel designations (e.g., JIS G4051 S45C for medium carbon steel, roughly equivalent to AISI 1045)
appear on drawings from Japanese OEM customers. JIS has its own chemical composition windows and
testing requirements that may differ slightly from ASTM or DIN equivalents. Again, engineering cross-
reference documentation is required.

ISO Standards:
ISO 683 series covers heat-treatable steels and is relevant to international customer specifications.
ISO 3522 covers aluminum alloy castings. ISO standards are increasingly referenced alongside ASTM
in dual-approved customer supply agreements.

UNS (Unified Numbering System):
The UNS is an alphanumeric designation system used primarily in North America to cross-reference
metals across ASTM, SAE, and other standards. UNS numbers appear on material certifications and
are a reliable cross-reference tool. The full UNS-to-ASTM cross-reference table is available from
the process engineering office and on the facility intranet.

When a work order specifies a grade designation not immediately recognizable, the operator must
consult engineering or quality before proceeding. Never assume grade equivalence without documentation.
"""

version = "0.0.1"
