Research & Development

LCC-G

A new low temperature impact property Carbon/ Manganese Steel

So what does this mean for the Design Engineer?

Simply put, it means don’t expect the same mechanical properties in heavy sections as light sections in ferritic steel castings such as ASTM A352 Grade LCC.

PASS

Typical Properties where T=50mm tested at 1/4T

UTS	0.2% Proof	Elongation	Red of Area	Impact	Avg Impacts
(N/mm²)	(N/mm²)	(%)	(%)	(Joules)	(Joules)
485min	275min	22min	35min	22min	27min
520	305	25	62	44 \| 47 \| 52	48

FAIL

Typical Properties where T=250mm tested at 1/4T

UTS	0.2% Proof	Elongation	Red of Area	Impact	Avg Impacts
(N/mm²)	(N/mm²)	(%)	(%)	(Joules)	(Joules)
485min	275min	22min	35min	22min	27min
497	289	20	22	8 \| 10 \| 11	10

Many Ferritic Steel Castings are produced world wide with section sizes greater than 100mm, so how can the mechanical properties and design parameters be guaranteed in these components?

This is the reason for the development by Goodwin of the LCC-G Ferritic Steel grade.

The new LCC-G grade steel was developed to capture the full potential of the cast material, utilising optimised chemistry and processing parameters which now achieves through section mechanical properties that had not been previously possible.

Rip up the Rules with LCC-G

Vastly increased impact properties in heavy sections
Much improved heavy section material ductility
Improvements translating to actual product
Much greater levels of confidence and safety achieved for End Users

With LCC-G the low temperature impact resistance and tensile ductility do not dramatically decrease with increase in section size, but instead stay far more consistent throughout.

50mm Test Block
1/2T Average Impacts: 163J at -50°C
1/2T Elongation: 38%
1/2T Reduction in Area: 78%

250mm Test Block
1/2T Average Impacts: 145J at -50⁰C
1/2T Elongation: 34%
1/2T Reduction in Area: 76%

User benefit from unsurpassed low temperature impact properties using LCC-G, providing a level of brittle fracture mode failure not previous achievable with the LCC Grade.