[Permintaan terhadap munisi kaliber besar untuk kebutuhan bidang HanKam didalam negeri sangat tinggi. Oleh karena itu, produsen harus mengimpor bahanbaku Cu-Zn 70/30 dari luar negeri dengan harga yang tinggi. Hal ini yangmenyebabkan produsen di dalam negeri berlomba untuk menguasai teknologipembuatan selongsong peluru kaliber besar agar dapat meningkatkan kemandiriandi bidang HanKam supaya biaya produksi menjadi lebih rendah. Salah satunyaadalah menggunakan proses thixocasting untuk menghasilkan preform/mangkukCu-Zn 70/30 dari billet yang dilanjutkan dengan ironing. Keberhasilan prosesironing tergantung dari mampu bentuk dingin material Cu-Zn 70/30 yangdigunakan. Oleh karena itu, pada penelitian ini dipelajari bagaimanameningkatkan mampu bentuk dingin dengan metode thermomechanicalcontrolled processed menggunakan teknologi canai hangat. Teknologi canaihangat dilakukan dengan metode double pass reversible sebanyak 25% x 2, 30%x 2, dan 35% x 2 dengan variabel temperatur 300oC, 400oC, dan 500oC. Denganmelakukan pengamatan metalografi baik menggunakan optical microscopemaupun FE-SEM, pengujian mekanik baik uji tarik maupun uji keras mikrovickers, dan pengujian mampu bentuk dengan swift test menghasilkan kesimpulanyaitu derajat deformasi aktual canai hangat yang dilakukan tidak sesuai denganteoritis, namun dari variabel canai hangat yang dilakukan masih bisa dihasilkansifat mampu bentuk terbaik yaitu pada benda uji yang dideformasi canai hangat ditemperatur 500oC dengan derajat deformasi aktual sebesar 38.7%. Sifat mampubentuk yang tinggi berhubungan dengan sifat mekanik dan struktur mikro yangdihasilkan yaitu ukuran butir halus mencapai 29 μm, berbentuk equiaxed dengannilai GAR mencapai 1.2, dan nilai kekerasan mikro yang tinggi mencapai 155HV. Selain itu, kekuatan UTS dan YS tertinggi masing-masing sebesar 533 MPadan 435 MPa juga didapatkan dari benda uji yang dilakukan parameter deformasicanai hangat di temperatur 500oC dengan derajat deformasi aktual 38.7%.Sedangkan apabila dilihat dari sifat mampu bentuknya maka benda uji yangdideformasi canai hangat pada kondisi parameter ini memiliki nilai koefisienpengerasan regang yang tinggi sebesar 0.00228, nilai anisotropi normal rata-ratayang tinggi sebesar 0.5452, nilai anisotropi planar (Δr) yang rendah yaitu Δr<1sebesar -0.42, LDR tinggi sebesar 2.625, dan tinggi mangkuk terbesar yaitu 10.31mm.;The needs of high calibre munition for Indonesian army is very high. Tofulfill this strategic requirement, the government has to import this munition eventhe price is very high. This condition stimulates local industry to obtain the latesttechnology to produce high calibre munition, especially on casing. It is expectedthat the price will be lower by producing high calibre munition in Indonesia. Onof technology which is used to produce high calibre casing munition isthixocasting to produce pre-formed cup of Cu-Zn from billet then followed byironing process. The quality result of ironoing process is mostly dependent oncold formability of Cu-Zn 70/30 material used. Therefore, this research focuses tostudy how to improve cold formability by implemented thermo mechanicalcontrolled processed with warm rolling. Warm rolling is conducted on doublepass reversible method with deformation 25% x 2, 30% x 2, and 35% x 2 atvarious temperatur 300oC, 400oC, and 500oC. The specimens are then examinedand tested by several method such as metallography using optical microscopy andFE SEM, tensile test, vickers hardness test and swift test to observed coldformability. The result indicate that the aktual degree of deformasi of warmrolling can not be achieved as planned due to some problems with the equipment.However, the best formability can be measured, where the best formability isobtained for specimens which were warm rolled at temperatur 500oC with aktualdeformation 38.7%. Formability is strongly related to the mechanical propertiesand its microstructure where the best formability obtained for the specimenswhich has 29 μm grain size in equiaxed form and has GAR value of 1.2, andmaximmum hardness value is 155 HV. This specimen has UTS and YSmaximum are 533 MPa and 435 MPa, maximum strain hardening coefficient0.00228, average anisotropic 0.5452, anisotropic planar Δr<1 at -0.42, LDRmaximum 2.625, and the height of cup is 10.31 mm., The needs of high calibre munition for Indonesian army is very high. Tofulfill this strategic requirement, the government has to import this munition eventhe price is very high. This condition stimulates local industry to obtain the latesttechnology to produce high calibre munition, especially on casing. It is expectedthat the price will be lower by producing high calibre munition in Indonesia. Onof technology which is used to produce high calibre casing munition isthixocasting to produce pre-formed cup of Cu-Zn from billet then followed byironing process. The quality result of ironoing process is mostly dependent oncold formability of Cu-Zn 70/30 material used. Therefore, this research focuses tostudy how to improve cold formability by implemented thermo mechanicalcontrolled processed with warm rolling. Warm rolling is conducted on doublepass reversible method with deformation 25% x 2, 30% x 2, and 35% x 2 atvarious temperatur 300oC, 400oC, and 500oC. The specimens are then examinedand tested by several method such as metallography using optical microscopy andFE SEM, tensile test, vickers hardness test and swift test to observed coldformability. The result indicate that the aktual degree of deformasi of warmrolling can not be achieved as planned due to some problems with the equipment.However, the best formability can be measured, where the best formability isobtained for specimens which were warm rolled at temperatur 500oC with aktualdeformation 38.7%. Formability is strongly related to the mechanical propertiesand its microstructure where the best formability obtained for the specimenswhich has 29 μm grain size in equiaxed form and has GAR value of 1.2, andmaximmum hardness value is 155 HV. This specimen has UTS and YSmaximum are 533 MPa and 435 MPa, maximum strain hardening coefficient0.00228, average anisotropic 0.5452, anisotropic planar Δr<1 at -0.42, LDRmaximum 2.625, and the height of cup is 10.31 mm.]