In my items.xml

<item id="1466" name="TitanFragment">
	<property name="Meshfile" value="Items/Misc/sackPrefab" />
	<property name="DropMeshfile" value="Items/Misc/sack_droppedPrefab" />
	<property name="Material" value="Mtitan" />
	<property name="CustomIcon" value="ironFragment" />
	<property name="CustomIconTint" value="005580" />
	<property name="Weight" value="5" />
	<property name="Stacknumber" value="10000" /> <!-- STK resource -->
	<property name="SellableToTrader" value="false" />
	<property name="HoldType" value="45" />
	<property name="DropScale" value="3" />
	<property name="EconomicValue" value="50" />
	<property name="EconomicBundleSize" value="5" />
	<property name="Group" value="Resources" />
</item>

<item id="1467" name="unit_titan">
                                        <property name="CustomIcon" value="scrapIron" />
	<property name="CustomIconTint" value="005580" />
	<property name="Meshfile" value="Items/Misc/sackPrefab" />
	<property name="DropMeshfile" value="Items/Misc/sack_droppedPrefab" />
                                        <property name="Material" value="Mtitan" />
	<property name="HoldType" value="45" />
	<property name="Stacknumber" value="30000" />
	<property name="Weight" value="1" />
	<property name="Group" value="Resources" />
	<property name="ResourceUnit" value="true" />
                                        <property name="MeltTimePerUnit" value="0.1" />
                                        <property name="UserHidden" value="true" />
	<property name="CraftingIngredientTime" value="0.15" />
	<property name="CreativeMode" value="Dev"/>
</item>


<item id="1468" name="titan_bar">
	<property name="CustomIcon" value="forgedSteel" />
	<property name="Meshfile" value="Items/Crafting/ingotIron" />
	<property name="CustomIconTint" value="005580" />
	<property name="Material" value="Mtitan" />
	<property name="Stacknumber" value="1000" /> <!-- STK resource -->
	<property name="EconomicValue" value="64" />
	<property name="RepairTime" value="1"/>
	<property name="RepairAmount" value="400"/>

</item>

<item id="1469" name="scrapTitan">
<property name="Extends" value="scrapIron" />
<property name="CustomIcon" value="scrapIron"/>
<property name="CustomIconTint" value="005580" />
<property name="Material" value="Mtitan" />
<property name="Weight" value="1" />
</item>




In material.xml

<material id="Mtitan">
<property name="damage_category" value="metal" />
<property name="surface_category" value="metal" />
<property name="forge_category" value="titan" />
<property name="Hardness" type="float" value="1" />
<property name="explosionresistance" value="0" />
<property name="stepsound" value="metal" />
<property name="lightopacity" value="4" />
<property name="stability_glue" value="16" />
<property name="Mass" type="int" value="4" />
<property name="MaxDamage" value="18000" />
</material>


In recipe.xml

<recipe name="titan_bar" count="1" craft_area="forge" craft_tool="forgeCrucible" material_based="true">
	<ingredient name="unit_clay" count="10"/>
	<ingredient name="unit_titan" count="20"/>
</recipe>


In blocks.xml

<block id="2042" name="titanOre">
	<property name="Extends" value="bedrock" />
	<property name="CustomIcon" value="bedrock" />
	<property name="Material" value="Mmetal_medium" />
	<property name="MaxDamage" value="2000" />
	<property name="DropScale" value="2" />
	<drop event="Harvest" name="TitanFragment" count="19" prob="1.0" tool_category="harvestingTools"/>
	<drop event="Destroy" count="0"/>
	<drop event="Fall" name="TitanFragment" count="36" prob=".75" stick_chance="0" />
	<property name="CanMobsSpawnOn" value="true"/>
</block>


and the Titan block I'm trying to create.

<block id="2043" name="titanBlock">
    <property name="CustomIcon" value="stainlessSteelBlock" />
	<property name="Group" value="Building"/>
	<property name="Material" value="Mtitan"/>
	<property name="MaxDamage" value="18000"/>
	<property name="PassThroughDamage" value="true"/>
	<property name="Texture" value="552"/>
	<!-- <property name="ImposterExchange" value="imposterBlock" param1="112"/> -->
	<property name="CreativeMode" value="None"/>
	<property class="RepairItems"> <property name="titan_bar" value="8"/> </property>
	<property class="UpgradeBlock">
	<property name="ToBlock" value="titanBlock"/>
	<property name="Item" value="titan_bar"/>
	<property name="ItemCount" value="10"/>
	<property name="UpgradeHitCount" value="4"/>
	</property>
	<property name="DowngradeBlock" value="stainlessSteelBlock"/>
	<property name="CustomUpgradeSound" value="place_block_metal"/>
	<drop event="Fall" name="scrapTitan" count="1" prob="0.75" stick_chance="1"/>
	<property name="EconomicValue" value="160"/>
	<property name="DescriptionKey" value="steelBlockGroupDesc"/>
</block>