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  <xs:element id="fstr_DefinedContributionPlanNumber" abstract="false" name="DefinedContributionPlanNumber" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fstr_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards" abstract="false" name="DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_RevenueFromContractWithCustomerPercentage" abstract="false" name="RevenueFromContractWithCustomerPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="fstr_StockRepurchaseProgramAuthorizedAmountAnnualLimitation" abstract="false" name="StockRepurchaseProgramAuthorizedAmountAnnualLimitation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_AchievementOfStockPriceMilestoneMember" abstract="true" name="AchievementOfStockPriceMilestoneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_FabricatedSteelProductsMember" abstract="true" name="FabricatedSteelProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_StandardProductWarrantyAccrualReclassification" abstract="false" name="StandardProductWarrantyAccrualReclassification" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="fstr_NumberOfPotentiallyResponsiblePartiesIncludedInAgreement" abstract="false" name="NumberOfPotentiallyResponsiblePartiesIncludedInAgreement" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="fstr_DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag" abstract="false" name="DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="fstr_PNCBankNACitizensBankNAWellsFargoBankNationalAssociationBankOfAmericaNAAndBMOHarrisBankNationalAssociationMember" abstract="true" name="PNCBankNACitizensBankNAWellsFargoBankNationalAssociationBankOfAmericaNAAndBMOHarrisBankNationalAssociationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_PriorCreditFacilityMember" abstract="true" name="PriorCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_ScheduleOfRevenuesByMajorProductLineTableTextBlock" abstract="false" name="ScheduleOfRevenuesByMajorProductLineTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="fstr_ImprovementsToLandAndLeaseholdsMember" abstract="false" name="ImprovementsToLandAndLeaseholdsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="fstr_LineOfCreditAccordionFeatureLowerBorrowingCapacityOption" abstract="false" name="LineOfCreditAccordionFeatureLowerBorrowingCapacityOption" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
