CB6 Martensitic Stainless Steel Casting Material

Martensitic Stainless Steel

Introduction

CB6 is a martensitic stainless steel grade covered by ASTM A743. Typical family applications include runner sections, turbine blades, guide components, pump impellers and pump casings.

Field	Value
Designation	CB6
Material Type	Stainless Steel
Sub Type	Martensitic Stainless Steel
Product Form	casting

Manufacturing Process

Investment Casting
Shell Molding Casting
Sand Casting

Equivalent Materials

Standard	Material Grade
EN 10293	GX4CrNi16-4

Similar Materials

N/A

Reference Standards

Standard	Standard Title	Edition	Specification	Identifier
ASTM A743	Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application	03	CB6	UNS J91804

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Physical Properties

N/A

Chemical Composition

Element	ASTM A743Edition 03
C	≤ 0.06 %
Si	≤ 1.00 %
Mn	≤ 1.00 %
P	≤ 0.04 %
S	≤ 0.03 %
Cr	15.5–17.5 %
Ni	3.5–5.5 %
Mo	≤ 0.5 %

Heat Treatment

ASTM A743–03 · Forced-air cooling and tempering

Step	Operation	Temperature	Cooling
1	Heat	1800–1920 °F / 980–1050 °C	—
2	Forced-air cool	≤ 120 °F / ≤ 50 °C	forced air
3	Temper	1100–1160 °F / 595–625 °C	—

Mechanical Properties

Core Mechanical Properties

ASTM A743 — 03 · Table S12.1 — Normative

Property	Value
Tensile Strength	≥ 115 ksi^[1] ≥ 790 MPa^[1]
Yield Strength	≥ 85 ksi^[1] ≥ 580 MPa^[1]
Elongation	≥ 16 %^[1]
Reduction of Area	≥ 35 %^[1]

Notes

ASTM A743 · Edition 03

[1] Tensile Strength/Yield Strength/Elongation/Reduction of Area: Applies only when Supplementary Requirement S12 is specified; Condition: heat treatment per; separately cast keel block per S12.2 unless S12.3 agreement applies

Welding Conditions

N/A

Applications

Martensitic stainless steel ASTM A743 Grade CB6 is typically used for turbine runner blade castings for hydropower equipment. Other cast components used in this material family include runner sections, turbine blades, guide components, pump impellers and pump casings. Applications include hydroelectric generating equipment, power-station replacement components and turbine refurbishment.

Water quality, entrained solids and cavitation conditions remain relevant to the particular installation.

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Last Updated: November 6, 2026

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