ASTM A351 Grade CF3M

STANDARDASTM A351FORMCastingEN 102131.4409 (near equivalent)UNSJ92800Wrought counterpart316L

The low-carbon version of CF8M (the cast counterpart of 316L). Eliminates the risk of intergranular corrosion in welded bodies that are not heat treated.

Rp0.2 · MPa: ≥ 205
Rm · MPa: ≥ 485
TEMPERATURE: −196 … +455 °C
COST

Representative sample of CF3M: machined top face and as-cast side — REPRESENTATIVE IMAGE

Chemical composition

C≤ 0.03

Si≤ 1.50

Mn≤ 1.50

P≤ 0.04

S≤ 0.04

Cr17.0–21.0

Ni9.0–13.0

Mo2.0–3.0

%, single values are maximums.

Mechanical properties

STANDARD · CONDITION	Rp0.2 MPa	Rp1.0 MPa	Rm MPa	A %	KV J
ASTM A351 · CF3M	205	—	≥ 485	30	—

Room temperature, solution annealed (ASTM A351).

ASME B16.34 pressure-temperature ratings

CLASS · bar	−29 … 38 °C	100 °C	200 °C	300 °C	400 °C	500 °C
Class 150	19.0	16.2	13.7	10.2	6.5	2.8
Class 300	49.6	42.2	35.7	31.6	29.4	28.2
Class 600	99.3	84.4	71.3	63.2	58.9	56.5
Class 900	148.9	126.6	107.0	94.9	88.3	84.7
Class 1500	248.2	211.0	178.3	158.1	147.2	140.9
Class 2500	413.7	351.6	297.2	263.5	245.3	235.0

Standard class, bar. Material group: CF8M/CF3M. Greyed values are outside the material's service range (−196 … +455 °C). Flanged-end ratings end at 538 °C.

Service temperature

−196 °C+455 °C−200−1000100200300400500600700800

This is the limit of the material itself. A valve's service temperature is usually set by the seal and seat materials; product pages give it for each seal option.

Physical properties and heat treatment

HEAT TREATMENT: Solution annealing ≥ 1040 °C, rapid cooling.

Media suitability GENERAL TREND

Fresh water

Seawater

Steam

Hydrocarbons, oil

Dilute acid

Caustic

Air, gas

Low temperature

Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.

Strengths and weaknesses

Strengths

Resistant to intergranular corrosion after welding
Same corrosion resistance as CF8M
Suitable for cryogenic service

Weaknesses

Not used above 455 °C
Slightly more expensive and less readily available than CF8M

Manufacturing and use

ECONOMY: Medium.
MANUFACTURING METHODS: Sand casting · Investment casting
TYPICAL VALVE PARTS: Body · Bonnet · Disc

Source: ASTM A351. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.