Twin Screw

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Twin screws are usually combined using several parts of different structures for a specific purpose. This particular type is often called a segmented screw. Omega provides custom made segmented screws and shafts in a specific size, even when that size is more than 10 meters. A few examples are shown below.

Conveying element
Conveying element
Mixing element
Mixing element
Mixer element

Omega applies alloy coating strategies to protect the surface of the twin screw from corrosion and abrasion caused by additives in engineering material and thermoplastic material. In doing so, the screw becomes much more durable. This screw type is known as a bimetallic twin screw.

Three different types of bimetallic screws with different protection strategies are shown below.

All working face covered by alloy layers

Flight covered by alloy layers

The screw body with a driving function is made using a high toughness steel, and the flight is made using an powder metallurgy steel

Recommended materials for twin screw

WR5
W6M5Cr4V2(M2)
C12MoV(D2)

Major Chemical and Hardness Comparison Table of Recommended Material for Segment Screw & Kneading Disk

Name	Material Type	Fe	C	Cr	Si	Mn	Mo	Ni	V	W	Hardness
WR 5	Powder Tool Steel	Bal	2.4～2.7	5.0～7.0	0.5～1.0	≤0.5	1.3～1.6	--	9.0～10.0	--	HRC 60 ～ 64
W6M5Cr4V2(M2)	High Speed Steel	Bal	0.80 ～ 0.90	3.8 ～ 4.4	0.20 ～ 0.45	0.15 ～ 0.40	4.5 ～ 5.5	≤0.30	1.75 ～ 2.20	5.50 ～ 6.75	HRC 60 ～ 64
C12MoV(D2)	Die Steel	Bal	1.45 ～ 1.70	11.0 ～ 12.5	≤0.40	≤0.40	0.4～0.6	≤0.25	0.15 ～ 0.30	--	HRC 58 ～ 60

Recommended materials for shaft

WR 30
45CrNiMoVA
40CrNiMoA(4340)

Major Chemical and Hardness Comparison Table of Recommended Material for Screw Shaft

Name	Material Type	Fe	C	Cr	Si	Mn	Mo	Ni	Other	Stand Torque Level
WR 30	High Nitrogen Steel	Bal	0.25 ～ 0.30	14.0 ～ 16.0	0.9 ～ 1.10	0.9 ～ 1.1	0.85 ～ 1.10	0.40 ～ 0.60	N 0.3 ～ 0.5	11 Grade，L/D ≥48
45CrNiMoVA	High Torque Steel	Bal	0.42 ～ 0.49	0.80 ～ 1.10	0.17 ～ 0.37	0.5 ～ 0.8	0.20 ～ 0.30	1.30 ～ 1.80	V 0.1 ～ 0.2	9 Grade，L/D 48
40CrNiMoA(4340)	Torque Steel	Bal	0.37 ～ 0.44	0.60 ～ 0.90	0.17 ～ 0.37	0.5 ～ 0.8	0.15 ～ 0.25	1.25 ～ 1.65	--	8 Grade，L/D 36 ～ 48