ASTM Fittings Materials

Overview

Engineering reference data for ASTM Fittings Materials in standard organizations.

Key Formulas

ISO Standard

$ISO \; 9001:2015$

Quality management systems.

ASTM Standard

$ASTM \; E8$

Standard test methods for tension testing.

ANSI Standard

$ANSI/ASME \; B16.5$

Pipe flanges and flanged fittings.

Variables

Symbol	Description	Unit
$ISO$	International Organization for Standardization	—
$ASTM$	American Society for Testing and Materials	—
$ANSI$	American National Standards Institute	—

References

• Original Source

ASTM Material Cross Reference Table

The following table provides a cross reference of ASTM material specifications for fittings, flanges, unions, and cast and forged valves across different material grades and service conditions.

Material Selection Notes

When selecting materials from this table, consider the following service conditions:

• High Temperature Service: Materials prefixed with "H" (e.g., 304H, 316H, 321H) are designed for elevated temperature applications with enhanced creep resistance
• Low Temperature / Cryogenic Service: Grades with "L" designation (e.g., LF1, LF2, LCB, WPL6) provide improved toughness at sub-zero temperatures
• Low Carbon Grades: The "L" suffix on stainless steels (e.g., 304L, 316L) indicates maximum 0.03% carbon, reducing susceptibility to intergranular corrosion after welding

ASTM Specification Prefix Meanings:

• *A105/A182/A350 — Forged fittings and flanges
• *A216/A217/A351/A352 — Castings
• *A234/A403/A420 — Wrought (butt-weld) fittings
• *A106/A312/A333/A671 — Pipe