Meehanite Worldwide Corporation (MWC)

NODULAR / DUCTILE IRONS

The Metallurgy of MEEHANITE Nodular Iron

This range of cast irons is known under a variety of names - Nodular, SG iron, Ductile or Spheroidal Graphite iron. These materials possess strength and ductile properties of a different type to flake or grey cast irons, whilst maintaining comparable machining characteristics.

While providing mechanical properties similar to cast steel or malleable iron, nodular iron presents few of the problems met with either (founding, high heat treatment and distortion, seize and section limitations etc).

As nodular iron can be poured at temperatures much lower than for cast steel, cast finish and dimensional accuracy are improved.

For more information on this subject why not email us and ask for a copy of the brochure:
"MEEHANITE Nodular Graphite Irons for General Engineering Applications"

Typical Mechanical and Physical Properties

(from separately cast test pieces of standard round 25mm diameter)

MEEHANITE TYPE	Tensile Strength (min) N/mm²	0.2% Proof Stress (min) N/mm²	Elongation % (min)	Brinell Hardness HB30
SFF350 SFF400 SF400 SF420.12 SFP500 SPF600 SP700 SH800 SH1000	350 400 400 420 500 600 700 800 1000	220 250 250 260 320 380 440 500 600	24 20 17 12 8 4 3 2 1	110 - 150 120 - 160 140 - 190 150 - 200 170 - 220 200 - 250 230 - 280 250 - 320 280 - 550

Technical Data on Property Values v. Section

MEEHANITE TYPE	GUIDANCE VALUES IN RELATION TO WALL SECTION
	Wall Section mm from/to	Anticipated minimum values in the casting
		Tensile Strength N/mm²	0.2% Proof Stress N/mm²	Elongation %
SFF350 SFF400 SF400 SFP500 SPF600 SP700	up to 50 50 / 80 80 / 120 120 / 200 up to 50 50 / 80 80 / 120 120 / 200 up to 50 50 / 80 80 / 120 120 / 200 up to 50 50 / 80 80 / 120 120 / 200 up to 50 50 / 80 80 / 120 120 / 200 up to 50 50 / 80 80 / 120 120 / 200	350 340 330 320 400 380 370 360 400 380 370 360 500 450 440 430 600 520 470 450 700 600 570 520	220 210 200 190 250 240 230 220 250 240 230 230 320 300 290 280 380 340 320 320 400 380 370 360	22 19 16 12 20 17 14 10 17 15 12 8 8 7 6 5 3 2 1 1 2 1 1 1