Blow bar

Making Model

Pouring

Casting

Quenching technology

Test
HRC ：60-66

Finished product

Finished product

Finished product

• We have various kinds of material solutions for blow bar to work
in different conditions from low to high wear or impact, to
maximumly down the cost for our customers.

Martensitic steelManganese steel
Chrome steel Ceramic

SELECTION OF BLOW BARS

Blow bar Recommended for Properties
Manganese steel ＞ Mild abrasiveness,
e.g. Limestone
＞ In case of very large feed size
＞ When there is very high proportion
of unbreakable objects in the feed
material e.g. iron
＞ Manganese is used when an increased impact
resistance or elongation capability is a prerequisite.
When the impact force is sufficient, the manganese
steel of the blow bar consolidates(cold consolidation)
and therefore reduces the wear.
Chrome steel ＞ Secondary crushing level with
natural
＞ In case of smaller feed sizes
＞ Chromium steel is Characterised in particular by its
increased hardness and has the advantage of being
particularly wear resistant in applications where
manganese and martensitic steels wear down more
quickly.
Chrome steel with
ceramic
＞ Secondary crushing level with
very abrasive natural stone or
river gravel
＞ Asphalt in case of smaller feed
size, milled material without any
iron content
＞ The bond between chrome body and ceramic inlays
ensures a constant wear profile with very abrasive
pre-crushed materials which are encountered
especially in gravel pits and quarries.

Blow bar Recommended for
Manganese steel ＞ Mild abrasiveness,
e.g. Limestone
＞ In case of very large feed size
＞ When there is very high proportion
of unbreakable objects in the feed
material e.g. iron
＞ Manganese is used when an increased impact
resistance or elongation capability is prerequisite.
When the impact force is sufficient, the manganese
steel of the blow bar consolidates(cold consolidation)
and therefore reduces the wear.
Chrome steel ＞ Secondary crushing level with
natural
＞ In case of smaller feed sizes
＞ Chromium steel is Characterised in particular by its
increased hardness and has the advantage of being
particularly wear resistant in applications where
manganese and martensitic steels wear down more
quickly.
Chrome steel with
ceramic
＞ Secondary crushing level with
very abrasive natural stone or
river gravel
＞ Asphalt in case of smaller feed
size, milled material without any
iron content
＞ The bond between chrome body and ceramic inlays
ensures a constant wear profile with very abrasive
pre-crushed materials which are encountered
especially in gravel pits and quarries.
Martensitic steel
with ceramic
＞Recycling of building rubble with
little to medium iron content
＞Concrete, Asphalt
＞Natural stone, Asphalt
＞ The blow bar comprises a martensitic body which is
reinforced on the inside with ceramic inlays. This composite
material combines the hardness of a ceramic with the
mechanical characteristics of steel and has a 2 to 4 times
longer service life when compared to blow bars made of
single alloys.

Applications

If molybdenum is missing, what is likely to happen?
Crack !!!!

Cr27Mo0.5 Cr27Mo1 Cr27Mo2
Adding molybdenum metal can obviously improve the properties of
materials:
1. Hardenability
2. Depth of hardening
3. Mechanical properties of
4. Oxidation resistance
5. Abrasion resistance
6. Refined internal crystal granularity.
Molybdenum metals are very important and very expensive.

If the impact is too high, what happens to the high
chrome Blow bar?
Broken down !!!! 791-3G Blow bar

Why does the Blow bar break down？
• I have looked carefully at the damaged photos of your customer's
Blow bar, and I think the Blow bar may have had two reasons:
• ① Although high chromium material has good wear resistance, its
impact toughness is very poor. When the stone material is too hard
and too large, it risks breaking.
• ② Usually, the Blow bar with the Cr27Mo2 material can withstand
greater impact. Maybe it's the Blow bar's quality.

Maybe they need to replace the rotor - urgently
—A lot of wear on discs.
—And I think this is a 4 row design.
—They should be using a 6 row.
—Heavy duty design

4 row → 6 row（Heavy duty design）

What do I suggest?
• You can try different materials and test their performance through a
trial order.
Name Material Purchase quantity
Pcs
Unit price
$/Kg
Discount price
$
Blow bar Mn18Cr2 8 2.247 2
Blow bar Cr27Mo2 8 3.5154 3.3
Blow bar High chromium
blow bar with
ceramic inserts
8 5.084 4.8